9r^2-25=

Solution for 9r^2-25= equation:

Simplifying
9r2 + -25 = 0

Reorder the terms:
-25 + 9r2 = 0

Solving
-25 + 9r2 = 0

Solving for variable 'r'.

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

Add '25' to each side of the equation.
-25 + 25 + 9r2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 9r2 = 0 + 25
9r2 = 0 + 25

Combine like terms: 0 + 25 = 25
9r2 = 25

Divide each side by '9'.
r2 = 2.777777778

Simplifying
r2 = 2.777777778

Take the square root of each side:
r = {-1.666666667, 1.666666667}