Mister Exam
Other calculators
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How to use it?
- Equation:
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Equation 2*x^2-x-1=x^2-5*x-(-1-x^2)
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Equation cos(x)=3
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Equation sin(x)+cos(x)=-1
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Equation sin(x)-cos(x)=1
- Express {x} in terms of y where:
- 17*x+16*y=7
- 18*x-14*y=-12
- -8*x-15*y=15
- 20*x+5*y=-3
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Identical expressions
- one - seven *(four +2x)=- nine -4x
- 1 minus 7 multiply by (4 plus 2x) equally minus 9 minus 4x
- one minus seven multiply by (four plus 2x) equally minus nine minus 4x
- 1-7(4+2x)=-9-4x
- 1-74+2x=-9-4x
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Similar expressions
- 1-7*(4+2x)=+9-4x
- 1-7*(4+2x)=-9+4x
- 0,5(8x+1)=15-(9-4x)
- 1-7*(4+2*x)=-9-4x
- 1+7*(4+2x)=-9-4x
- 1-7*(4-2x)=-9-4x
1-7*(4+2x)=-9-4x equation
The teacher will be very surprised to see your correct solution 😉
The solution
Detail solution
Given the linear equation:
Expand brackets in the left part
Looking for similar summands in the left part:
Move free summands (without x)
from left part to right part, we given:
$$- 14 x = 18 - 4 x$$
Move the summands with the unknown x
from the right part to the left part:
$$\left(-10\right) x = 18$$
Divide both parts of the equation by -10
We get the answer: x = -9/5
1-7*(4+2*x) = -9-4*x
Expand brackets in the left part
1-7*4-7*2*x = -9-4*x
Looking for similar summands in the left part:
-27 - 14*x = -9-4*x
Move free summands (without x)
from left part to right part, we given:
$$- 14 x = 18 - 4 x$$
Move the summands with the unknown x
from the right part to the left part:
$$\left(-10\right) x = 18$$
Divide both parts of the equation by -10
x = 18 / (-10)
We get the answer: x = -9/5
Sum and product of roots
[src]
sum
-9/5
$$- \frac{9}{5}$$
=
-9/5
$$- \frac{9}{5}$$
product
-9/5
$$- \frac{9}{5}$$
=
-9/5
$$- \frac{9}{5}$$
-9/5
The graph