a^2-225=(a-15)(a-15)

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Solution for a^2-225=(a-15)(a-15) equation: 



a^2-225=(a-15)(a-15)

We move all terms to the left:

a^2-225-((a-15)(a-15))=0

We multiply parentheses ..

a^2-((+a^2-15a-15a+225))-225=0



We calculate terms in parentheses: -((+a^2-15a-15a+225)), so:

(+a^2-15a-15a+225)

We get rid of parentheses

a^2-15a-15a+225

We add all the numbers together, and all the variables

a^2-30a+225

Back to the equation:

-(a^2-30a+225)



We get rid of parentheses

a^2-a^2+30a-225-225=0

We add all the numbers together, and all the variables

30a-450=0

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

30a=450

a=450/30

a=15

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