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Simplifying
4r2 + 1 = 325
Reorder the terms:
1 + 4r2 = 325
Solving
1 + 4r2 = 325
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-1' to each side of the equation.
1 + -1 + 4r2 = 325 + -1
Combine like terms: 1 + -1 = 0
0 + 4r2 = 325 + -1
4r2 = 325 + -1
Combine like terms: 325 + -1 = 324
4r2 = 324
Divide each side by '4'.
r2 = 81
Simplifying
r2 = 81
Take the square root of each side:
r = {-9, 9}
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