2x^2-8x-31=-7

Solution for 2x^2-8x-31=-7 equation:

Simplifying
2x2 + -8x + -31 = -7

Reorder the terms:
-31 + -8x + 2x2 = -7

Solving
-31 + -8x + 2x2 = -7

Solving for variable 'x'.

Reorder the terms:
-31 + 7 + -8x + 2x2 = -7 + 7

Combine like terms: -31 + 7 = -24
-24 + -8x + 2x2 = -7 + 7

Combine like terms: -7 + 7 = 0
-24 + -8x + 2x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-12 + -4x + x2) = 0

Factor a trinomial.
2((-2 + -1x)(6 + -1x)) = 0

Ignore the factor 2.
Subproblem 1
Set the factor '(-2 + -1x)' equal to zero and attempt to solve:

Simplifying
-2 + -1x = 0

Solving
-2 + -1x = 0

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

Add '2' to each side of the equation.
-2 + 2 + -1x = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -1x = 0 + 2
-1x = 0 + 2

Combine like terms: 0 + 2 = 2
-1x = 2

Divide each side by '-1'.
x = -2

Simplifying
x = -2
Subproblem 2
Set the factor '(6 + -1x)' equal to zero and attempt to solve:

Simplifying
6 + -1x = 0

Solving
6 + -1x = 0

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

Add '-6' to each side of the equation.
6 + -6 + -1x = 0 + -6

Combine like terms: 6 + -6 = 0
0 + -1x = 0 + -6
-1x = 0 + -6

Combine like terms: 0 + -6 = -6
-1x = -6

Divide each side by '-1'.
x = 6

Simplifying
x = 6
Solution
x = {-2, 6}