20r^2+0r-80=0

Solution for 20r^2+0r-80=0 equation:

Simplifying
20r2 + 0r + -80 = 0

Anything times zero is zero.
20r2 + 0r + -80 = 0

Reorder the terms:
0 + -80 + 20r2 = 0

Combine like terms: 0 + -80 = -80
-80 + 20r2 = 0

Solving
-80 + 20r2 = 0

Solving for variable 'r'.

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

Add '80' to each side of the equation.
-80 + 80 + 20r2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 20r2 = 0 + 80
20r2 = 0 + 80

Combine like terms: 0 + 80 = 80
20r2 = 80

Divide each side by '20'.
r2 = 4

Simplifying
r2 = 4

Take the square root of each side:
r = {-2, 2}