x^2-13-18=0

Solution for x^2-13-18=0 equation:

Simplifying
x2 + -13 + -18 = 0

Reorder the terms:
-13 + -18 + x2 = 0

Combine like terms: -13 + -18 = -31
-31 + x2 = 0

Solving
-31 + x2 = 0

Solving for variable 'x'.

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

Add '31' to each side of the equation.
-31 + 31 + x2 = 0 + 31

Combine like terms: -31 + 31 = 0
0 + x2 = 0 + 31
x2 = 0 + 31

Combine like terms: 0 + 31 = 31
x2 = 31

Simplifying
x2 = 31

Take the square root of each side:
x = {-5.567764363, 5.567764363}