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 = -15
-15 + x2 = 0

Solving
-15 + x2 = 0

Solving for variable 'x'.

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

Add '15' to each side of the equation.
-15 + 15 + x2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + x2 = 0 + 15
x2 = 0 + 15

Combine like terms: 0 + 15 = 15
x2 = 15

Simplifying
x2 = 15

Take the square root of each side:
x = {-3.872983346, 3.872983346}