0=x^2-5-66

Solution for 0=x^2-5-66 equation:

Simplifying
0 = x2 + -5 + -66

Reorder the terms:
0 = -5 + -66 + x2

Combine like terms: -5 + -66 = -71
0 = -71 + x2

Solving
0 = -71 + 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.
0 + -1x2 = -71 + x2 + -1x2
Remove the zero:
-1x2 = -71 + x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-1x2 = -71 + 0
-1x2 = -71

Divide each side by '-1'.
x2 = 71

Simplifying
x2 = 71

Take the square root of each side:
x = {-8.426149773, 8.426149773}