-5u^2+80=0

Solution for -5u^2+80=0 equation:

Simplifying
-5u2 + 80 = 0

Reorder the terms:
80 + -5u2 = 0

Solving
80 + -5u2 = 0

Solving for variable 'u'.

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

Add '-80' to each side of the equation.
80 + -80 + -5u2 = 0 + -80

Combine like terms: 80 + -80 = 0
0 + -5u2 = 0 + -80
-5u2 = 0 + -80

Combine like terms: 0 + -80 = -80
-5u2 = -80

Divide each side by '-5'.
u2 = 16

Simplifying
u2 = 16

Take the square root of each side:
u = {-4, 4}