-8x^2+72=0

Solution for -8x^2+72=0 equation:

Simplifying
-8x2 + 72 = 0

Reorder the terms:
72 + -8x2 = 0

Solving
72 + -8x2 = 0

Solving for variable 'x'.

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

Add '-72' to each side of the equation.
72 + -72 + -8x2 = 0 + -72

Combine like terms: 72 + -72 = 0
0 + -8x2 = 0 + -72
-8x2 = 0 + -72

Combine like terms: 0 + -72 = -72
-8x2 = -72

Divide each side by '-8'.
x2 = 9

Simplifying
x2 = 9

Take the square root of each side:
x = {-3, 3}