(X-3)^2=x^2+21

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Solution for (X-3)^2=x^2+21 equation: 



(X-3)^2=X^2+21

We move all terms to the left:

(X-3)^2-(X^2+21)=0

We get rid of parentheses

-X^2+(X-3)^2-21=0

We add all the numbers together, and all the variables

-1X^2+(X-3)^2-21=0

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

-1X^2+(X-3)^2=21

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