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Simplifying
16r2 + 3 = 84
Reorder the terms:
3 + 16r2 = 84
Solving
3 + 16r2 = 84
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-3' to each side of the equation.
3 + -3 + 16r2 = 84 + -3
Combine like terms: 3 + -3 = 0
0 + 16r2 = 84 + -3
16r2 = 84 + -3
Combine like terms: 84 + -3 = 81
16r2 = 81
Divide each side by '16'.
r2 = 5.0625
Simplifying
r2 = 5.0625
Take the square root of each side:
r = {-2.25, 2.25}
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