x+21=(x+15)2

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Solution for x+21=(x+15)2 equation: 



x+21=(x+15)2

We move all terms to the left:

x+21-((x+15)2)=0



We calculate terms in parentheses: -((x+15)2), so:

(x+15)2

We multiply parentheses

2x+30

Back to the equation:

-(2x+30)



We get rid of parentheses

x-2x-30+21=0

We add all the numbers together, and all the variables

-1x-9=0

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

-x=9

x=9/-1

x=-9

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