0=6.28r^2+401.92-8038.4

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Solution for 0=6.28r^2+401.92-8038.4 equation: 


Simplifying
0 = 6.28r2 + 401.92 + -8038.4

Reorder the terms:
0 = 401.92 + -8038.4 + 6.28r2

Combine like terms: 401.92 + -8038.4 = -7636.48
0 = -7636.48 + 6.28r2

Solving
0 = -7636.48 + 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.
0 + -6.28r2 = -7636.48 + 6.28r2 + -6.28r2
Remove the zero:
-6.28r2 = -7636.48 + 6.28r2 + -6.28r2

Combine like terms: 6.28r2 + -6.28r2 = 0.00
-6.28r2 = -7636.48 + 0.00
-6.28r2 = -7636.48

Divide each side by '-6.28'.
r2 = 1216

Simplifying
r2 = 1216

Take the square root of each side:
r = {-34.871191548, 34.871191548}

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