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Simplifying
2r2 + 2 = 74
Reorder the terms:
2 + 2r2 = 74
Solving
2 + 2r2 = 74
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-2' to each side of the equation.
2 + -2 + 2r2 = 74 + -2
Combine like terms: 2 + -2 = 0
0 + 2r2 = 74 + -2
2r2 = 74 + -2
Combine like terms: 74 + -2 = 72
2r2 = 72
Divide each side by '2'.
r2 = 36
Simplifying
r2 = 36
Take the square root of each side:
r = {-6, 6}
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