r(2r)=40

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Solution for r(2r)=40 equation: 


Simplifying
r(2r) = 40

Remove parenthesis around (2r)
r * 2r = 40

Reorder the terms for easier multiplication:
2r * r = 40

Multiply r * r
2r2 = 40

Solving
2r2 = 40

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Divide each side by '2'.
r2 = 20

Simplifying
r2 = 20

Take the square root of each side:
r = {-4.472135955, 4.472135955}

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