X^2-3-18=

Solution for X^2-3-18= equation:

Simplifying
X2 + -3 + -18 = 0

Reorder the terms:
-3 + -18 + X2 = 0

Combine like terms: -3 + -18 = -21
-21 + X2 = 0

Solving
-21 + X2 = 0

Solving for variable 'X'.

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

Add '21' to each side of the equation.
-21 + 21 + X2 = 0 + 21

Combine like terms: -21 + 21 = 0
0 + X2 = 0 + 21
X2 = 0 + 21

Combine like terms: 0 + 21 = 21
X2 = 21

Simplifying
X2 = 21

Take the square root of each side:
X = {-4.582575695, 4.582575695}