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(x+6)^2=2x^2+16x+15
We move all terms to the left:
(x+6)^2-(2x^2+16x+15)=0
We get rid of parentheses
-2x^2+(x+6)^2-16x-15=0
We add all the numbers together, and all the variables
-2x^2-16x+(x+6)^2-15=0
We move all terms containing x to the left, all other terms to the right
-2x^2-16x+(x+6)^2=15
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