Mister Exam
Other calculators
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How to use it?
- Equation:
-
Equation 15-x=8
-
Equation x^2-4x+8=0
-
Equation x^2+3*x+9=0
-
Equation x^2-16*x+64=0
- Express {x} in terms of y where:
- 15*x+6*y=16
- 9*x-8*y=-6
- -11*x+1*y=-14
- -13*x-14*y=0
- Derivative of:
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-x
- Integral of d{x}:
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-x
- Graphing y =:
- -x
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Identical expressions
- three (x- seven)-6x=-x
- 3(x minus 7) minus 6x equally minus x
- three (x minus seven) minus 6x equally minus x
- 3x-7-6x=-x
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Similar expressions
- 3(x-7)-6x=+x
- (12+3x)-(7-6x)=5x-11
- 3(x+7)-6x=-x
- 3(x-7)+6x=-x
3(x-7)-6x=-x 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:
$$- 3 x = 21 - x$$
Move the summands with the unknown x
from the right part to the left part:
$$\left(-2\right) x = 21$$
Divide both parts of the equation by -2
We get the answer: x = -21/2
3*(x-7)-6*x = -x
Expand brackets in the left part
3*x-3*7-6*x = -x
Looking for similar summands in the left part:
-21 - 3*x = -x
Move free summands (without x)
from left part to right part, we given:
$$- 3 x = 21 - x$$
Move the summands with the unknown x
from the right part to the left part:
$$\left(-2\right) x = 21$$
Divide both parts of the equation by -2
x = 21 / (-2)
We get the answer: x = -21/2
Sum and product of roots
[src]
sum
-21/2
$$- \frac{21}{2}$$
=
-21/2
$$- \frac{21}{2}$$
product
-21/2
$$- \frac{21}{2}$$
=
-21/2
$$- \frac{21}{2}$$
-21/2
The graph