(x-12)x-15=30

Solution for (x-12)x-15=30 equation:

Simplifying
(x + -12) * x + -15 = 30

Reorder the terms:
(-12 + x) * x + -15 = 30

Reorder the terms for easier multiplication:
x(-12 + x) + -15 = 30
(-12 * x + x * x) + -15 = 30
(-12x + x2) + -15 = 30

Reorder the terms:
-15 + -12x + x2 = 30

Solving
-15 + -12x + x2 = 30

Solving for variable 'x'.

Reorder the terms:
-15 + -30 + -12x + x2 = 30 + -30

Combine like terms: -15 + -30 = -45
-45 + -12x + x2 = 30 + -30

Combine like terms: 30 + -30 = 0
-45 + -12x + x2 = 0

Factor a trinomial.
(-3 + -1x)(15 + -1x) = 0

Subproblem 1
Set the factor '(-3 + -1x)' equal to zero and attempt to solve:

Simplifying
-3 + -1x = 0

Solving
-3 + -1x = 0

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

Add '3' to each side of the equation.
-3 + 3 + -1x = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -1x = 0 + 3
-1x = 0 + 3

Combine like terms: 0 + 3 = 3
-1x = 3

Divide each side by '-1'.
x = -3

Simplifying
x = -3
Subproblem 2
Set the factor '(15 + -1x)' equal to zero and attempt to solve:

Simplifying
15 + -1x = 0

Solving
15 + -1x = 0

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

Add '-15' to each side of the equation.
15 + -15 + -1x = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -1x = 0 + -15
-1x = 0 + -15

Combine like terms: 0 + -15 = -15
-1x = -15

Divide each side by '-1'.
x = 15

Simplifying
x = 15
Solution
x = {-3, 15}