Use polynomial long division to divide 12x3 – 9x2 + 13x + 4 by 3x2 – 3x + 4. . I have worked the problem numerous times but I do not believe my answer is correct.

Question

anonymous · Answer

cheat

anonymous · Answer

http://www.wolframalpha.com/input/?i=%2812x3+%E2%80%93+9x2+%2B+13x+%2B+4+%29%2F%283x2+%E2%80%93+3x+%2B+4%29 apparently it goes in there evenly

anonymous · Answer

This is what I got : 4x + 1 . But when I check it, the solution does not match up.
                         4x R -3x + 4 ?
                        _____________________
3x^2 - 3x + 4 l 12x^3 - 3x^2 + 13x + 4
                          12x^3 - 3x^2 + 16x
(sub)                      0          0        -3x + 4

anonymous · Answer

not sure what you mean.  check by multiplying

anonymous · Answer

oh i see the mistake in what you wrote.

anonymous · Answer

you didn't multipy -3x by 4x. you wrote 12x^3-3x^2+16x
it should be 12x^3-12x^2+16x

anonymous · Answer

okay. i tried to type it so it looked like the actual equation/ my original answer I got was 4x + 1 but I am stilol unsure if that is right

anonymous · Answer

4x  +1
                        ___________________________
3x^3-3x+4     12x^3 - 9x^2 + 13x + 4
                        12x^3-12x^2+16x
                                     4x^2 -3x + 4
                                     4x^2-3x+4
                                                      0

anonymous · Answer

you made another mistake as well when you copied.  you put 
12x^3 - 3x^2 + 13x + 4

when it should have been
12x^3 - 9x^2 + 13x + 4

anonymous · Answer

somehow the -9 became a -3