X*X+18=139

Solution for X*X+18=139 equation:

Simplifying
X * X + 18 = 139

Multiply X * X
X2 + 18 = 139

Reorder the terms:
18 + X2 = 139

Solving
18 + X2 = 139

Solving for variable 'X'.

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

Add '-18' to each side of the equation.
18 + -18 + X2 = 139 + -18

Combine like terms: 18 + -18 = 0
0 + X2 = 139 + -18
X2 = 139 + -18

Combine like terms: 139 + -18 = 121
X2 = 121

Simplifying
X2 = 121

Take the square root of each side:
X = {-11, 11}