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Simplifying
7r2 + 8 = 491
Reorder the terms:
8 + 7r2 = 491
Solving
8 + 7r2 = 491
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-8' to each side of the equation.
8 + -8 + 7r2 = 491 + -8
Combine like terms: 8 + -8 = 0
0 + 7r2 = 491 + -8
7r2 = 491 + -8
Combine like terms: 491 + -8 = 483
7r2 = 483
Divide each side by '7'.
r2 = 69
Simplifying
r2 = 69
Take the square root of each side:
r = {-8.306623863, 8.306623863}
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