9+4=x^2

Solution for 9+4=x^2 equation:

Simplifying
9 + 4 = x2

Combine like terms: 9 + 4 = 13
13 = x2

Solving
13 = 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.
13 + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
13 + -1x2 = 0

Add '-13' to each side of the equation.
13 + -13 + -1x2 = 0 + -13

Combine like terms: 13 + -13 = 0
0 + -1x2 = 0 + -13
-1x2 = 0 + -13

Combine like terms: 0 + -13 = -13
-1x2 = -13

Divide each side by '-1'.
x2 = 13

Simplifying
x2 = 13

Take the square root of each side:
x = {-3.605551275, 3.605551275}