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Division of polynomials: answers not matching  TOPIC_SOLVED

On Elementary Algebra page 243 problem 72, it says to divide 9x^2 – 9x – 28 by 3x+4. The answer they gave was 3x-7 with no remainder. My answer was 3x+ 21 with a remainder of 84 - 112. This is what I did: 3x + 21 ------------- 3x+4) 9x^2 – 9x – 28 -9x^2 – 12x ------------- - 21x – 28 - 63x + 84 ----...
by myself5
on Thu Jan 22, 2009 5:09 pm
 
Forum: Beginning Algebra
Topic: Division of polynomials: answers not matching
Replies: 2
Views: 1817

Re:  TOPIC_SOLVED

stapel_eliz wrote:You did the first multiplication and subtraction, and ended up with -21x - 28 as your new dividend. Why did you multiply the 3x by -21 instead of by -7...? :oops:


Yeah, it appears I was using the wrong number. I think I have it figured out now. Thanks so much for your help!
by myself5
on Fri Jan 23, 2009 3:21 pm
 
Forum: Beginning Algebra
Topic: Division of polynomials: answers not matching
Replies: 2
Views: 1817

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