X^2-5-8=0

Solution for X^2-5-8=0 equation:

Simplifying
X2 + -5 + -8 = 0

Reorder the terms:
-5 + -8 + X2 = 0

Combine like terms: -5 + -8 = -13
-13 + X2 = 0

Solving
-13 + X2 = 0

Solving for variable 'X'.

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

Add '13' to each side of the equation.
-13 + 13 + X2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + X2 = 0 + 13
X2 = 0 + 13

Combine like terms: 0 + 13 = 13
X2 = 13

Simplifying
X2 = 13

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