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(u-4)^2=2u^2-18u+40
We move all terms to the left:
(u-4)^2-(2u^2-18u+40)=0
We get rid of parentheses
-2u^2+(u-4)^2+18u-40=0
We add all the numbers together, and all the variables
-2u^2+18u+(u-4)^2-40=0
We move all terms containing u to the left, all other terms to the right
-2u^2+18u+(u-4)^2=40
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