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Simplifying
5r2 + -12 = 68
Reorder the terms:
-12 + 5r2 = 68
Solving
-12 + 5r2 = 68
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '12' to each side of the equation.
-12 + 12 + 5r2 = 68 + 12
Combine like terms: -12 + 12 = 0
0 + 5r2 = 68 + 12
5r2 = 68 + 12
Combine like terms: 68 + 12 = 80
5r2 = 80
Divide each side by '5'.
r2 = 16
Simplifying
r2 = 16
Take the square root of each side:
r = {-4, 4}
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