(7+9)9=x^2

Solution for (7+9)9=x^2 equation:

Simplifying
(7 + 9) * 9 = x2

Combine like terms: 7 + 9 = 16
(16) * 9 = x2

Multiply 16 * 9
144 = x2

Solving
144 = x2

Solving for variable 'x'.

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

Add '-1x2' to each side of the equation.
144 + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
144 + -1x2 = 0

Add '-144' to each side of the equation.
144 + -144 + -1x2 = 0 + -144

Combine like terms: 144 + -144 = 0
0 + -1x2 = 0 + -144
-1x2 = 0 + -144

Combine like terms: 0 + -144 = -144
-1x2 = -144

Divide each side by '-1'.
x2 = 144

Simplifying
x2 = 144

Take the square root of each side:
x = {-12, 12}