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Simplifying
7r2 + -252 = 0
Reorder the terms:
-252 + 7r2 = 0
Solving
-252 + 7r2 = 0
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '252' to each side of the equation.
-252 + 252 + 7r2 = 0 + 252
Combine like terms: -252 + 252 = 0
0 + 7r2 = 0 + 252
7r2 = 0 + 252
Combine like terms: 0 + 252 = 252
7r2 = 252
Divide each side by '7'.
r2 = 36
Simplifying
r2 = 36
Take the square root of each side:
r = {-6, 6}
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