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Math Help - factor

  1. #1
    Member helloying's Avatar
    Joined
    Jul 2008
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    factor

    Find the value of P and q if 4x-4x-3 is a factor of the expression 8x^4+px+qx+x+3.

    The factor of it thta that get frm 4x-4x-3 is (x-3/2)(x+1/2)
    so i sub in as 8(3/2)^4+p(3/2)^3....
    and 8(-1/2)^4...
    then i get 3(3/8)p+2(1/4)q=-45 and (-1/8)p+(1/4)q=-3
    then i sub and got p=-4. however theans was p=-12 and q=-6. i did again and again but could not the the ans. can anyone kindly help me?
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  2. #2
    MHF Contributor kalagota's Avatar
    Joined
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    Taguig City, Philippines
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    Quote Originally Posted by helloying View Post
    Find the value of P and q if 4x-4x-3 is a factor of the expression 8x^4+px+qx+x+3.

    The factor of it thta that get frm 4x-4x-3 is (x-3/2)(x+1/2)
    so i sub in as 8(3/2)^4+p(3/2)^3....
    and 8(-1/2)^4...
    then i get 3(3/8)p+2(1/4)q=-45 and (-1/8)p+(1/4)q=-3
    then i sub and got p=-4. however theans was p=-12 and q=-6. i did again and again but could not the the ans. can anyone kindly help me?
    did you get the correct faqctorization?

    x = \frac{4 \pm \sqrt{16+48}}{8}

    ..yeah you are right..

    try to write your complete solution..
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  3. #3
    Member helloying's Avatar
    Joined
    Jul 2008
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    Quote Originally Posted by kalagota View Post
    did you get the correct faqctorization?

    x = \frac{4 \pm \sqrt{16+48}}{8}

    ..yeah you are right..

    try to write your complete solution..
    I did complete it but my ans was different from the ans given. i want to ask if i i sub in the value correctly and is the two eqn i get is correct.
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