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Math Help - Finding Zeros

  1. #1
    Junior Member casey_k's Avatar
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    Finding Zeros

    I'm reviewing for a math exam and i need help finding zeros again. =(
    How many zeros do the following functions have?
    a) y= 6x^2 -6x -9
    b) f(x)= -6(x+3)^2 -2
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  2. #2
    Super Member
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    Quote Originally Posted by casey_k View Post
    I'm reviewing for a math exam and i need help finding zeros again. =(
    How many zeros do the following functions have?
    a) y= 6x^2 -6x -9
    b) f(x)= -6(x+3)^2 -2
    For zeros, you set the function equal to 0.

     6x^2-6x-9 = 0

    You can solve this using the quadratic equation:

     x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}

     -6(x+3)^2 - 2 = 0

     -6(x^2+6x+9) - 2 = 0

     -6x^2-36x-56 = 0

    Use the same formula.
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