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Factoring Completely!


I got

On my test my teacher said it was party wrong.And she underlined the two Thirteen's i had in my answer.
And i don't understand why!?
Also on another one.The problem is..

I got

But she crossed out the numbers two and one, on my paper.And i don't understand Why?

Please if you could HELP ME!
i would be very greatful!

Factor completely means complete. You can factor 13 out...

if you multiply out what you put in parenthisis, it wont be equal to the original. Notice the - sign on the last term.

what is any number to a negative power equal to?

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