-2(x-3)(x+3)-18=0

Solution for -2(x-3)(x+3)-18=0 equation:

Simplifying
-2(x + -3)(x + 3) + -18 = 0

Reorder the terms:
-2(-3 + x)(x + 3) + -18 = 0

Reorder the terms:
-2(-3 + x)(3 + x) + -18 = 0

Multiply (-3 + x) * (3 + x)
-2(-3(3 + x) + x(3 + x)) + -18 = 0
-2((3 * -3 + x * -3) + x(3 + x)) + -18 = 0
-2((-9 + -3x) + x(3 + x)) + -18 = 0
-2(-9 + -3x + (3 * x + x * x)) + -18 = 0
-2(-9 + -3x + (3x + x2)) + -18 = 0

Combine like terms: -3x + 3x = 0
-2(-9 + 0 + x2) + -18 = 0
-2(-9 + x2) + -18 = 0
(-9 * -2 + x2 * -2) + -18 = 0
(18 + -2x2) + -18 = 0

Reorder the terms:
18 + -18 + -2x2 = 0

Combine like terms: 18 + -18 = 0
0 + -2x2 = 0
-2x2 = 0

Solving
-2x2 = 0

Solving for variable 'x'.

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

Divide each side by '-2'.
x2 = 0

Simplifying
x2 = 0

Take the square root of each side:
x = {0}