r=(2a)(2a)

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Solution for r=(2a)(2a) equation: 


Simplifying
r = (2a)(2a)

Remove parenthesis around (2a)
r = 2a(2a)

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

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

Multiply 2 * 2
r = 4a * a

Multiply a * a
r = 4a2

Solving
r = 4a2

Solving for variable 'r'.

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

Simplifying
r = 4a2

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