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Simplifying
13r2 + -117 = 0
Reorder the terms:
-117 + 13r2 = 0
Solving
-117 + 13r2 = 0
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '117' to each side of the equation.
-117 + 117 + 13r2 = 0 + 117
Combine like terms: -117 + 117 = 0
0 + 13r2 = 0 + 117
13r2 = 0 + 117
Combine like terms: 0 + 117 = 117
13r2 = 117
Divide each side by '13'.
r2 = 9
Simplifying
r2 = 9
Take the square root of each side:
r = {-3, 3}
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