(x+8)(x-8)=225

Solution for (x+8)(x-8)=225 equation:

Simplifying
(x + 8)(x + -8) = 225

Reorder the terms:
(8 + x)(x + -8) = 225

Reorder the terms:
(8 + x)(-8 + x) = 225

Multiply (8 + x) * (-8 + x)
(8(-8 + x) + x(-8 + x)) = 225
((-8 * 8 + x * 8) + x(-8 + x)) = 225
((-64 + 8x) + x(-8 + x)) = 225
(-64 + 8x + (-8 * x + x * x)) = 225
(-64 + 8x + (-8x + x2)) = 225

Combine like terms: 8x + -8x = 0
(-64 + 0 + x2) = 225
(-64 + x2) = 225

Solving
-64 + x2 = 225

Solving for variable 'x'.

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

Add '64' to each side of the equation.
-64 + 64 + x2 = 225 + 64

Combine like terms: -64 + 64 = 0
0 + x2 = 225 + 64
x2 = 225 + 64

Combine like terms: 225 + 64 = 289
x2 = 289

Simplifying
x2 = 289

Take the square root of each side:
x = {-17, 17}