66=x*x

Solution for 66=x*x equation:

Simplifying
66 = x * x

Multiply x * x
66 = x2

Solving
66 = 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.
66 + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
66 + -1x2 = 0

Add '-66' to each side of the equation.
66 + -66 + -1x2 = 0 + -66

Combine like terms: 66 + -66 = 0
0 + -1x2 = 0 + -66
-1x2 = 0 + -66

Combine like terms: 0 + -66 = -66
-1x2 = -66

Divide each side by '-1'.
x2 = 66

Simplifying
x2 = 66

Take the square root of each side:
x = {-8.124038405, 8.124038405}