r=(3a)(2a+5a)

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Solution for r=(3a)(2a+5a) equation: 


Simplifying
r = (3a)(2a + 5a)

Remove parenthesis around (3a)
r = 3a(2a + 5a)

Combine like terms: 2a + 5a = 7a
r = 3a(7a)

Remove parenthesis around (7a)
r = 3a * 7a

Reorder the terms for easier multiplication:
r = 3 * 7a * a

Multiply 3 * 7
r = 21a * a

Multiply a * a
r = 21a2

Solving
r = 21a2

Solving for variable 'r'.

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

Simplifying
r = 21a2

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