90=(a+2a)2

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Solution for 90=(a+2a)2 equation: 



90=(a+2a)2

We move all terms to the left:

90-((a+2a)2)=0

We add all the numbers together, and all the variables

-((+3a)2)+90=0



We calculate terms in parentheses: -((+3a)2), so:

(+3a)2

We multiply parentheses

6a

Back to the equation:

-(6a)



We move all terms containing a to the left, all other terms to the right

-6a=-90

a=-90/-6

a=+15

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