(x+15)(x-15)=

Solution for (x+15)(x-15)= equation:

Simplifying
(x + 15)(x + -15) = 0

Reorder the terms:
(15 + x)(x + -15) = 0

Reorder the terms:
(15 + x)(-15 + x) = 0

Multiply (15 + x) * (-15 + x)
(15(-15 + x) + x(-15 + x)) = 0
((-15 * 15 + x * 15) + x(-15 + x)) = 0
((-225 + 15x) + x(-15 + x)) = 0
(-225 + 15x + (-15 * x + x * x)) = 0
(-225 + 15x + (-15x + x2)) = 0

Combine like terms: 15x + -15x = 0
(-225 + 0 + x2) = 0
(-225 + x2) = 0

Solving
-225 + x2 = 0

Solving for variable 'x'.

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

Add '225' to each side of the equation.
-225 + 225 + x2 = 0 + 225

Combine like terms: -225 + 225 = 0
0 + x2 = 0 + 225
x2 = 0 + 225

Combine like terms: 0 + 225 = 225
x2 = 225

Simplifying
x2 = 225

Take the square root of each side:
x = {-15, 15}