0=(x^2-9)

Solution for 0=(x^2-9) equation:

Simplifying
0 = (x2 + -9)

Reorder the terms:
0 = (-9 + x2)

Remove parenthesis around (-9 + x2)
0 = -9 + x2

Solving
0 = -9 + 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.
0 + -1x2 = -9 + x2 + -1x2
Remove the zero:
-1x2 = -9 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-1x2 = -9 + 0
-1x2 = -9

Divide each side by '-1'.
x2 = 9

Simplifying
x2 = 9

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