-x^2+20+40=0

Solution for -x^2+20+40=0 equation:

Simplifying
-1x2 + 20 + 40 = 0

Reorder the terms:
20 + 40 + -1x2 = 0

Combine like terms: 20 + 40 = 60
60 + -1x2 = 0

Solving
60 + -1x2 = 0

Solving for variable 'x'.

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

Add '-60' to each side of the equation.
60 + -60 + -1x2 = 0 + -60

Combine like terms: 60 + -60 = 0
0 + -1x2 = 0 + -60
-1x2 = 0 + -60

Combine like terms: 0 + -60 = -60
-1x2 = -60

Divide each side by '-1'.
x2 = 60

Simplifying
x2 = 60

Take the square root of each side:
x = {-7.745966692, 7.745966692}