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Simplifying
7(2r2 + -25) = 63
Reorder the terms:
7(-25 + 2r2) = 63
(-25 * 7 + 2r2 * 7) = 63
(-175 + 14r2) = 63
Solving
-175 + 14r2 = 63
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '175' to each side of the equation.
-175 + 175 + 14r2 = 63 + 175
Combine like terms: -175 + 175 = 0
0 + 14r2 = 63 + 175
14r2 = 63 + 175
Combine like terms: 63 + 175 = 238
14r2 = 238
Divide each side by '14'.
r2 = 17
Simplifying
r2 = 17
Take the square root of each side:
r = {-4.123105626, 4.123105626}
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