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Simplifying
8r2 + -9 = 279
Reorder the terms:
-9 + 8r2 = 279
Solving
-9 + 8r2 = 279
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 + 8r2 = 279 + 9
Combine like terms: -9 + 9 = 0
0 + 8r2 = 279 + 9
8r2 = 279 + 9
Combine like terms: 279 + 9 = 288
8r2 = 288
Divide each side by '8'.
r2 = 36
Simplifying
r2 = 36
Take the square root of each side:
r = {-6, 6}
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