80r^2-125=

Solution for 80r^2-125= equation:

Simplifying
80r2 + -125 = 0

Reorder the terms:
-125 + 80r2 = 0

Solving
-125 + 80r2 = 0

Solving for variable 'r'.

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

Add '125' to each side of the equation.
-125 + 125 + 80r2 = 0 + 125

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

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

Divide each side by '80'.
r2 = 1.5625

Simplifying
r2 = 1.5625

Take the square root of each side:
r = {-1.25, 1.25}