8a^2-72=

Solution for 8a^2-72= equation:

Simplifying
8a2 + -72 = 0

Reorder the terms:
-72 + 8a2 = 0

Solving
-72 + 8a2 = 0

Solving for variable 'a'.

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

Add '72' to each side of the equation.
-72 + 72 + 8a2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + 8a2 = 0 + 72
8a2 = 0 + 72

Combine like terms: 0 + 72 = 72
8a2 = 72

Divide each side by '8'.
a2 = 9

Simplifying
a2 = 9

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