[x^2+x-15]=15

Solution for [x^2+x-15]=15 equation:

Simplifying
[x2 + x + -15] = 15

Reorder the terms:
[-15 + x + x2] = 15

Remove brackets around [-15 + x + x2]
-15 + x + x2 = 15

Solving
-15 + x + x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + -15 + x + x2 = 15 + -15

Combine like terms: -15 + -15 = -30
-30 + x + x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-30 + x + x2 = 0

Factor a trinomial.
(-6 + -1x)(5 + -1x) = 0

Subproblem 1
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
Subproblem 2
Set the factor '(5 + -1x)' equal to zero and attempt to solve:

Simplifying
5 + -1x = 0

Solving
5 + -1x = 0

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

Add '-5' to each side of the equation.
5 + -5 + -1x = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -1x = 0 + -5
-1x = 0 + -5

Combine like terms: 0 + -5 = -5
-1x = -5

Divide each side by '-1'.
x = 5

Simplifying
x = 5
Solution
x = {-6, 5}