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Simplifying
75.36 = 3.14r2 * 2
Reorder the terms for easier multiplication:
75.36 = 3.14 * 2r2
Multiply 3.14 * 2
75.36 = 6.28r2
Solving
75.36 = 6.28r2
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '-6.28r2' to each side of the equation.
75.36 + -6.28r2 = 6.28r2 + -6.28r2
Combine like terms: 6.28r2 + -6.28r2 = 0.00
75.36 + -6.28r2 = 0.00
Add '-75.36' to each side of the equation.
75.36 + -75.36 + -6.28r2 = 0.00 + -75.36
Combine like terms: 75.36 + -75.36 = 0.00
0.00 + -6.28r2 = 0.00 + -75.36
-6.28r2 = 0.00 + -75.36
Combine like terms: 0.00 + -75.36 = -75.36
-6.28r2 = -75.36
Divide each side by '-6.28'.
r2 = 12
Simplifying
r2 = 12
Take the square root of each side:
r = {-3.464101615, 3.464101615}
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