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Simplifying
4r2 + -4 = 172
Reorder the terms:
-4 + 4r2 = 172
Solving
-4 + 4r2 = 172
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '4' to each side of the equation.
-4 + 4 + 4r2 = 172 + 4
Combine like terms: -4 + 4 = 0
0 + 4r2 = 172 + 4
4r2 = 172 + 4
Combine like terms: 172 + 4 = 176
4r2 = 176
Divide each side by '4'.
r2 = 44
Simplifying
r2 = 44
Take the square root of each side:
r = {-6.633249581, 6.633249581}
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