(x+12)(x-5)=x^2+31

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Solution for (x+12)(x-5)=x^2+31 equation:


Simplifying
(x + 12)(x + -5) = x2 + 31

Reorder the terms:
(12 + x)(x + -5) = x2 + 31

Reorder the terms:
(12 + x)(-5 + x) = x2 + 31

Multiply (12 + x) * (-5 + x)
(12(-5 + x) + x(-5 + x)) = x2 + 31
((-5 * 12 + x * 12) + x(-5 + x)) = x2 + 31
((-60 + 12x) + x(-5 + x)) = x2 + 31
(-60 + 12x + (-5 * x + x * x)) = x2 + 31
(-60 + 12x + (-5x + x2)) = x2 + 31

Combine like terms: 12x + -5x = 7x
(-60 + 7x + x2) = x2 + 31

Reorder the terms:
-60 + 7x + x2 = 31 + x2

Add '-1x2' to each side of the equation.
-60 + 7x + x2 + -1x2 = 31 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-60 + 7x + 0 = 31 + x2 + -1x2
-60 + 7x = 31 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-60 + 7x = 31 + 0
-60 + 7x = 31

Solving
-60 + 7x = 31

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '60' to each side of the equation.
-60 + 60 + 7x = 31 + 60

Combine like terms: -60 + 60 = 0
0 + 7x = 31 + 60
7x = 31 + 60

Combine like terms: 31 + 60 = 91
7x = 91

Divide each side by '7'.
x = 13

Simplifying
x = 13

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