x^2-3-18=0

Solution for x^2-3-18=0 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}