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Simplifying
7850 = r2 * 3.14
Reorder the terms for easier multiplication:
7850 = 3.14r2
Solving
7850 = 3.14r2
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-3.14r2' to each side of the equation.
7850 + -3.14r2 = 3.14r2 + -3.14r2
Combine like terms: 3.14r2 + -3.14r2 = 0.00
7850 + -3.14r2 = 0.00
Add '-7850' to each side of the equation.
7850 + -7850 + -3.14r2 = 0.00 + -7850
Combine like terms: 7850 + -7850 = 0
0 + -3.14r2 = 0.00 + -7850
-3.14r2 = 0.00 + -7850
Combine like terms: 0.00 + -7850 = -7850
-3.14r2 = -7850
Divide each side by '-3.14'.
r2 = 2500
Simplifying
r2 = 2500
Take the square root of each side:
r = {-50, 50}
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