-9=-x^2

Solution for -9=-x^2 equation:

Simplifying
-9 = -1x2

Solving
-9 = -1x2

Solving for variable 'x'.

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

Add 'x2' to each side of the equation.
-9 + x2 = -1x2 + x2

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

Add '9' to each side of the equation.
-9 + 9 + x2 = 0 + 9

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

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

Simplifying
x2 = 9

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