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Simplifying
9r2 + -7 = 569
Reorder the terms:
-7 + 9r2 = 569
Solving
-7 + 9r2 = 569
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '7' to each side of the equation.
-7 + 7 + 9r2 = 569 + 7
Combine like terms: -7 + 7 = 0
0 + 9r2 = 569 + 7
9r2 = 569 + 7
Combine like terms: 569 + 7 = 576
9r2 = 576
Divide each side by '9'.
r2 = 64
Simplifying
r2 = 64
Take the square root of each side:
r = {-8, 8}
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