18=x*x

Solution for 18=x*x equation:

Simplifying
18 = x * x

Multiply x * x
18 = x2

Solving
18 = x2

Solving for variable 'x'.

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

Add '-1x2' to each side of the equation.
18 + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
18 + -1x2 = 0

Add '-18' to each side of the equation.
18 + -18 + -1x2 = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -1x2 = 0 + -18
-1x2 = 0 + -18

Combine like terms: 0 + -18 = -18
-1x2 = -18

Divide each side by '-1'.
x2 = 18

Simplifying
x2 = 18

Take the square root of each side:
x = {-4.242640687, 4.242640687}