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Simplifying
9r2 + 9 = 25
Reorder the terms:
9 + 9r2 = 25
Solving
9 + 9r2 = 25
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-9' to each side of the equation.
9 + -9 + 9r2 = 25 + -9
Combine like terms: 9 + -9 = 0
0 + 9r2 = 25 + -9
9r2 = 25 + -9
Combine like terms: 25 + -9 = 16
9r2 = 16
Divide each side by '9'.
r2 = 1.777777778
Simplifying
r2 = 1.777777778
Take the square root of each side:
r = {-1.333333333, 1.333333333}
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