When and how do you use perfect squares on integrals?

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So when using a perfect square I would divide the linear middle term by 2 and put the x in squared ( ) along with that term?
 
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pillar said:
So when using a perfect square I would divide the linear middle term by 2 and put the x in squared ( ) along with that term?
Do you have a particular problem in mind? Completing the square is a bit more involved than what you're describing.