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March 28, 2017

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USE THE AC METHOD FACTORING 9+^2+5+-4 CAN SOME ONE SHOW ME THE STEP TO SOLVING THIS PROBLEM

  • MATH - ,

    9x^2 + 5x - 4

    the AC method

    Multiply the 9 times -4

    You have -36

    think of factors that will multiple to equal -36 but add to equal the middle number 5.

    36 times -1 no
    9 times -4 yes

    Sometimes it takes awhile to find the right numbers.

    Once you do, you write them and -4x + 9x

    You replace the middle term with them.

    9x^2 -4x + 9x - 4

    Next, you factor by grouping

    (9x^2 -4x) + (9x - 4)

    Take out the common factor in each group.

    x(9x-4) + 1(9x-4)

    see the (9x-4)... you write that down once and get your other factor from what is left over (x+1)

    FINAL ANSWER: (9x-4)(x+1)

    Multiply those factors to check to be sure you are correct.

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