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Math Help - please tell me if this is correct

  1. #1
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    Question please tell me if this is correct

    Im trying here........

    (4x-1)(3x+2)=0

    My answer came out as....

    12x^2 + 5x - 2 is this correct?
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  2. #2
    Moo
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    Hello,
    Quote Originally Posted by tpoma View Post
    Im trying here........

    (4x-1)(3x+2)=0

    My answer came out as....

    12x^2 + 5x - 2 is this correct?
    If you're asked to expand, then you're correct.

    But if you're asked to solve for x, it's not the method.
    If you want to solve the equation (4x-1)(3x+2)=0, just remember that ab=0 if a=0 or b=0
    So 4x-1=0 or 3x+2=0
    This gives 2 solutions.
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  3. #3
    GAMMA Mathematics
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    Quote Originally Posted by tpoma View Post
    Im trying here........

    (4x-1)(3x+2)=0

    My answer came out as....

    12x^2 + 5x - 2 is this correct?
    Moo answered your two possible questions. Instead of multiplying it out and using the quadratic formula, it is much easier to solve for each term of the product.

    If you let a=3x+2=0, then it doesn't matter what 4x-1 is because the entire product will be zero. This enables you to solve each term of the product for zero giving you two solutions. Two answers should make sense to you because when the equation is a quadratic (of degree two).
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