The teacher will be very surprised to see your correct solution 😉
2 2 2 8*x + 8*y - 16*a*(x - y) + 15*a - 48*y - 50*a + 71 = 0
a*x^2 + b*x + c = 0
D = b^2 - 4 * a * c =
(-16*a)^2 - 4 * (8) * (71 - 50*a - 48*y + 8*y^2 + 15*a^2 + 16*a*y) = -2272 - 256*y^2 - 224*a^2 + 1536*y + 1600*a - 512*a*y
x1 = (-b + sqrt(D)) / (2*a)
x2 = (-b - sqrt(D)) / (2*a)
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| / 2 / / 2 2 2 2 \\ | / 2 / / 2 2 2 2 \\
| 4 / 2 / 2 2 2 2 \ |atan2\-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a), -142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/| | 4 / 2 / 2 2 2 2 \ |atan2\-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a), -142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/|
| \/ (-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a)) + \-142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/ *sin|---------------------------------------------------------------------------------------------------------------------------------------------------------------------| | \/ (-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a)) + \-142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/ *cos|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| \ 2 / | \ 2 /
x1 = I*|- ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ + im(a)| - ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ + re(a)
\ 4 / 4
/ _______________________________________________________________________________________________________________________________________________________________________ \ _______________________________________________________________________________________________________________________________________________________________________
| / 2 / / 2 2 2 2 \\ | / 2 / / 2 2 2 2 \\
|4 / 2 / 2 2 2 2 \ |atan2\-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a), -142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/| | 4 / 2 / 2 2 2 2 \ |atan2\-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a), -142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/|
|\/ (-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a)) + \-142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/ *sin|---------------------------------------------------------------------------------------------------------------------------------------------------------------------| | \/ (-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a)) + \-142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/ *cos|---------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| \ 2 / | \ 2 /
x2 = I*|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ + im(a)| + ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ + re(a)
\ 4 / 4
x2 = i*(((-28*re(a)*im(a) - 32*re(y)*im(y) + 100*im(a) + 96*im(y) - 32*im(a*y))^2 + (-14*re(a)^2 + 100*re(a) - 16*re(y)^2 + 96*re(y) - 32*re(a*y) + 14*im(a)^2 + 16*im(y)^2 - 142)^2)^(1/4)*sin(atan2(-28*re(a)*im(a) - 32*re(y)*im(y) + 100*im(a) + 96*im(y) - 32*im(a*y, -14*re(a)^2 + 100*re(a) - 16*re(y)^2 + 96*re(y) - 32*re(a*y) + 14*im(a)^2 + 16*im(y)^2 - 142)/2)/4 + im(a)) + ((-28*re(a)*im(a) - 32*re(y)*im(y) + 100*im(a) + 96*im(y) - 32*im(a*y))^2 + (-14*re(a)^2 + 100*re(a) - 16*re(y)^2 + 96*re(y) - 32*re(a*y) + 14*im(a)^2 + 16*im(y)^2 - 142)^2)^(1/4)*cos(atan2(-28*re(a)*im(a) - 32*re(y)*im(y) + 100*im(a) + 96*im(y) - 32*im(a*y), -14*re(a)^2 + 100*re(a) - 16*re(y)^2 + 96*re(y) - 32*re(a*y) + 14*im(a)^2 + 16*im(y)^2 - 142)/2)/4 + re(a))
sum
/ _______________________________________________________________________________________________________________________________________________________________________ \ _______________________________________________________________________________________________________________________________________________________________________ / _______________________________________________________________________________________________________________________________________________________________________ \ _______________________________________________________________________________________________________________________________________________________________________ | / 2 / / 2 2 2 2 \\ | / 2 / / 2 2 2 2 \\ | / 2 / / 2 2 2 2 \\ | / 2 / / 2 2 2 2 \\ | 4 / 2 / 2 2 2 2 \ |atan2\-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a), -142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/| | 4 / 2 / 2 2 2 2 \ |atan2\-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a), -142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/| |4 / 2 / 2 2 2 2 \ |atan2\-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a), -142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/| | 4 / 2 / 2 2 2 2 \ |atan2\-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a), -142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/| | \/ (-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a)) + \-142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/ *sin|---------------------------------------------------------------------------------------------------------------------------------------------------------------------| | \/ (-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a)) + \-142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/ *cos|---------------------------------------------------------------------------------------------------------------------------------------------------------------------| |\/ (-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a)) + \-142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/ *sin|---------------------------------------------------------------------------------------------------------------------------------------------------------------------| | \/ (-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a)) + \-142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/ *cos|---------------------------------------------------------------------------------------------------------------------------------------------------------------------| | \ 2 / | \ 2 / | \ 2 / | \ 2 / I*|- ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ + im(a)| - ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ + re(a) + I*|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ + im(a)| + ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ + re(a) \ 4 / 4 \ 4 / 4
=
/ _______________________________________________________________________________________________________________________________________________________________________ \ / _______________________________________________________________________________________________________________________________________________________________________ \
| / 2 / / 2 2 2 2 \\ | | / 2 / / 2 2 2 2 \\ |
| 4 / 2 / 2 2 2 2 \ |atan2\-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a), -142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/| | |4 / 2 / 2 2 2 2 \ |atan2\-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a), -142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/| |
| \/ (-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a)) + \-142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/ *sin|---------------------------------------------------------------------------------------------------------------------------------------------------------------------| | |\/ (-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a)) + \-142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/ *sin|---------------------------------------------------------------------------------------------------------------------------------------------------------------------| |
| \ 2 / | | \ 2 / |
2*re(a) + I*|- ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ + im(a)| + I*|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ + im(a)|
\ 4 / \ 4 /
product
/ / _______________________________________________________________________________________________________________________________________________________________________ \ _______________________________________________________________________________________________________________________________________________________________________ \ / / _______________________________________________________________________________________________________________________________________________________________________ \ _______________________________________________________________________________________________________________________________________________________________________ \ | | / 2 / / 2 2 2 2 \\ | / 2 / / 2 2 2 2 \\ | | | / 2 / / 2 2 2 2 \\ | / 2 / / 2 2 2 2 \\ | | | 4 / 2 / 2 2 2 2 \ |atan2\-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a), -142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/| | 4 / 2 / 2 2 2 2 \ |atan2\-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a), -142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/| | | |4 / 2 / 2 2 2 2 \ |atan2\-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a), -142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/| | 4 / 2 / 2 2 2 2 \ |atan2\-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a), -142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/| | | | \/ (-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a)) + \-142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/ *sin|---------------------------------------------------------------------------------------------------------------------------------------------------------------------| | \/ (-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a)) + \-142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/ *cos|---------------------------------------------------------------------------------------------------------------------------------------------------------------------| | | |\/ (-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a)) + \-142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/ *sin|---------------------------------------------------------------------------------------------------------------------------------------------------------------------| | \/ (-32*im(a*y) + 96*im(y) + 100*im(a) - 32*im(y)*re(y) - 28*im(a)*re(a)) + \-142 - 32*re(a*y) - 16*re (y) - 14*re (a) + 14*im (a) + 16*im (y) + 96*re(y) + 100*re(a)/ *cos|---------------------------------------------------------------------------------------------------------------------------------------------------------------------| | | | \ 2 / | \ 2 / | | | \ 2 / | \ 2 / | |I*|- ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ + im(a)| - ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ + re(a)|*|I*|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ + im(a)| + ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ + re(a)| \ \ 4 / 4 / \ \ 4 / 4 /
=
2 2 71 2 2 25*re(a) 15*im (a) 15*re (a) 25*I*im(a) 15*I*im(a)*re(a) -- + re (y) - im (y) - 6*re(y) + 2*re(a*y) - -------- - --------- + --------- - 6*I*im(y) + 2*I*im(a*y) - ---------- + 2*I*im(y)*re(y) + ---------------- 8 4 8 8 4 4
71/8 + re(y)^2 - im(y)^2 - 6*re(y) + 2*re(a*y) - 25*re(a)/4 - 15*im(a)^2/8 + 15*re(a)^2/8 - 6*i*im(y) + 2*i*im(a*y) - 25*i*im(a)/4 + 2*i*im(y)*re(y) + 15*i*im(a)*re(a)/4