-9+20=x^2

Solution for -9+20=x^2 equation:

Simplifying
-9 + 20 = x2

Combine like terms: -9 + 20 = 11
11 = x2

Solving
11 = 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.
11 + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
11 + -1x2 = 0

Add '-11' to each side of the equation.
11 + -11 + -1x2 = 0 + -11

Combine like terms: 11 + -11 = 0
0 + -1x2 = 0 + -11
-1x2 = 0 + -11

Combine like terms: 0 + -11 = -11
-1x2 = -11

Divide each side by '-1'.
x2 = 11

Simplifying
x2 = 11

Take the square root of each side:
x = {-3.31662479, 3.31662479}