28.26=3.14r^2*2

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Solution for 28.26=3.14r^2*2 equation: 


Simplifying
28.26 = 3.14r2 * 2

Reorder the terms for easier multiplication:
28.26 = 3.14 * 2r2

Multiply 3.14 * 2
28.26 = 6.28r2

Solving
28.26 = 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.
28.26 + -6.28r2 = 6.28r2 + -6.28r2

Combine like terms: 6.28r2 + -6.28r2 = 0.00
28.26 + -6.28r2 = 0.00

Add '-28.26' to each side of the equation.
28.26 + -28.26 + -6.28r2 = 0.00 + -28.26

Combine like terms: 28.26 + -28.26 = 0.00
0.00 + -6.28r2 = 0.00 + -28.26
-6.28r2 = 0.00 + -28.26

Combine like terms: 0.00 + -28.26 = -28.26
-6.28r2 = -28.26

Divide each side by '-6.28'.
r2 = 4.5

Simplifying
r2 = 4.5

Take the square root of each side:
r = {-2.121320344, 2.121320344}

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