125r^2-80=

Solution for 125r^2-80= equation:

Simplifying
125r2 + -80 = 0

Reorder the terms:
-80 + 125r2 = 0

Solving
-80 + 125r2 = 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 + 125r2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 125r2 = 0 + 80
125r2 = 0 + 80

Combine like terms: 0 + 80 = 80
125r2 = 80

Divide each side by '125'.
r2 = 0.64

Simplifying
r2 = 0.64

Take the square root of each side:
r = {-0.8, 0.8}