Mister Exam
Other calculators
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How to use it?
- Equation:
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Equation 7*x^3-28*x=0
-
Equation sin(x)=0
-
Equation 2*x^2+18*x=0
- Equation x^2+18*x-19=0
- Express {x} in terms of y where:
- -6*x+16*y=3
- -12*x-2*y=2
- -12*x+2*y=15
- 12*x-13*y=-15
- Graphing y =:
- x-ln(x+1)
- Derivative of:
- x-ln(x+1)
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Identical expressions
- x-ln(x+ one)= one
- x minus ln(x plus 1) equally 1
- x minus ln(x plus one) equally one
- x-lnx+1=1
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Similar expressions
- x+ln(x+1)=1
- x-ln(x-1)=1
x-ln(x+1)=1 equation
The teacher will be very surprised to see your correct solution 😉
The solution
Rapid solution
[src]
/ -2\ x1 = -1 - W\-e /
$$x_{1} = -1 - W\left(- \frac{1}{e^{2}}\right)$$
/ -2 \ x2 = -1 - W\-e , -1/
$$x_{2} = -1 - W_{-1}\left(- \frac{1}{e^{2}}\right)$$
x2 = -1 - LambertW(-exp(-2, -1))
Sum and product of roots
[src]
sum
/ -2\ / -2 \ -1 - W\-e / + -1 - W\-e , -1/
$$\left(-1 - W\left(- \frac{1}{e^{2}}\right)\right) + \left(-1 - W_{-1}\left(- \frac{1}{e^{2}}\right)\right)$$
=
/ -2\ / -2 \ -2 - W\-e / - W\-e , -1/
$$-2 - W\left(- \frac{1}{e^{2}}\right) - W_{-1}\left(- \frac{1}{e^{2}}\right)$$
product
/ / -2\\ / / -2 \\ \-1 - W\-e //*\-1 - W\-e , -1//
$$\left(-1 - W\left(- \frac{1}{e^{2}}\right)\right) \left(-1 - W_{-1}\left(- \frac{1}{e^{2}}\right)\right)$$
=
/ / -2\\ / / -2 \\ \1 + W\-e //*\1 + W\-e , -1//
$$\left(W\left(- \frac{1}{e^{2}}\right) + 1\right) \left(W_{-1}\left(- \frac{1}{e^{2}}\right) + 1\right)$$
(1 + LambertW(-exp(-2)))*(1 + LambertW(-exp(-2), -1))