WILL GIVE MEDALS divide -2x^3+21x^2-20x-12 by (x-3)

Question

anonymous · Answer

can you help on this one @mathmale

anonymous · Answer

@nikato can you help

mathmale · Answer

DB:  Did I ask you about your experience with long division earlier this evening?

anonymous · Answer

yes

mathmale · Answer

This new problem involves long division (although it could also be done by synth. div.).  But you say you know neither one of those??

anonymous · Answer

correct can you work out the problem and tell me what your doing as you do it

mathmale · Answer

I've done it already on paper.  I could take a photo of my work and email you the photo if you'd be comfortable with that.  Don't give me your email address unless you are.

mathmale · Answer

OK...go ahead, delete it.
I've taken a photo, but can only try emailing it to you; my phone isn't working great at the moment.

anonymous · Answer

ok ill tell you if i get it

mathmale · Answer

My phone said, "Sending message."  Check your e-mail now.

mathmale · Answer

Phone still says, "sending."
Darn.  It's a large image and my Internet connection is not the greatest.
Anyway, perhaps we could continue tomorrow; I'd try to fill you in on long div.

anonymous · Answer

can you give me the answer and teach me tomorrow this is the last question of my study guide

mathmale · Answer

haven't given u p on this yet, but I need to hit the sack.  One way or another, I'll get the image to you or walk you thrugh the steps of long division.  Good night!

Scratch that.  my phone says the message went thru to you.

mathmale · Answer

I haven't checked my answer but am reasonably sure it is correct.  Your risk!
-2x^2 + 15x +25   remainder 63.

mathmale · Answer

did the image come through to you from my phone?

anonymous · Answer

no

mathmale · Answer

Well, look for me online tomorrow.  And I did give you what I believe is the correct answer.  I do expect we'll go over that tomorrow because you really do need to know long division.

anonymous · Answer

Here is an answer to check your work
$$
-2 x^3+21 x^2-20 x-12 = (-2 x^2+15 x+25) × (x-3)+63
$$

anonymous · Answer

More insight from http://www.wolframalpha.com/input/?i=+%28-2+x^3+%2B+21+x^2+-+20+x+-+12++%29%2F+%28x+-+3%29