Math!

Factoring Completely!

13b^2-13

I got
(13b-13)(1b-1).

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..
2d^2+3d-2

I got
(2d+2)(1d+1)

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!
thanx

Factor completely means complete. You can factor 13 out...
13(b-1)(b+1)

if you multiply out what you put in parenthisis, it wont be equal to the original. Notice the - sign on the last term.
Try
(2d-1)(d+2)

what is any number to a negative power equal to?

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