Hello all. I have a problem here with some sample questions off my video tutor cd that came with my text book.

I think they got the answers wrong on two out of the three examples they posted.

I have uploaded the math problems and their answers as pictures to imageshack so you can see exactly what I am talking about.

ImageShack® - Gallery

For the first one I got:

2r cubed -3r squared +9r

For the second one I got:

y squared -6y -5

and for the third I got the same exact number as them.

Ps how do I write the cubed and squard here besides typing them?

Also if I am wrong can someone explain how?

Thanks in advance for any help.