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Derivative (x^2-6x+9)(2x^2-x+1)

  1. May 6, 2004 #1
    I need to find the derivative of:

    (x^2-6x+9)(2x^2-x+1)

    what i did:
    (2x-6)(2x^2-x+1)+(4x-1)(x^2-6x+9)
    4x^3-2x^2+2x-12x^2+6x-6+4x^3-24x^2-36x-x^2+6x-9
    8x^3-39x^2-28x-15

    is this correct?
     
  2. jcsd
  3. May 6, 2004 #2

    HallsofIvy

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    Take a closer look at that "4x" times "9" term again!
     
  4. May 6, 2004 #3
    (2x-6)(2x^2-x+1)+(4x-1)(x^2-6x+9)
    4x^3-2x^2+2x-12x^2+6x-6+4x^3-24x^2+36x-x^2+6x-9
    8x^3-39x^2-50x-15

    thanks, is this right?
     
  5. May 6, 2004 #4
    I mean to write:
    8x^3-39x^2+50x-15
     
  6. May 6, 2004 #5
    that's what I got
     
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