3r^2-75=

Solution for 3r^2-75= equation:

Simplifying
3r2 + -75 = 0

Reorder the terms:
-75 + 3r2 = 0

Solving
-75 + 3r2 = 0

Solving for variable 'r'.

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

Add '75' to each side of the equation.
-75 + 75 + 3r2 = 0 + 75

Combine like terms: -75 + 75 = 0
0 + 3r2 = 0 + 75
3r2 = 0 + 75

Combine like terms: 0 + 75 = 75
3r2 = 75

Divide each side by '3'.
r2 = 25

Simplifying
r2 = 25

Take the square root of each side:
r = {-5, 5}