-x^2+64+16=0

Solution for -x^2+64+16=0 equation:

Simplifying
-1x2 + 64 + 16 = 0

Reorder the terms:
64 + 16 + -1x2 = 0

Combine like terms: 64 + 16 = 80
80 + -1x2 = 0

Solving
80 + -1x2 = 0

Solving for variable 'x'.

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

Add '-80' to each side of the equation.
80 + -80 + -1x2 = 0 + -80

Combine like terms: 80 + -80 = 0
0 + -1x2 = 0 + -80
-1x2 = 0 + -80

Combine like terms: 0 + -80 = -80
-1x2 = -80

Divide each side by '-1'.
x2 = 80

Simplifying
x2 = 80

Take the square root of each side:
x = {-8.94427191, 8.94427191}