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Math Help - finding a tangent line.......

  1. #1
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    finding a tangent line.......

    So i can't figure out the following:

    f(x) = 2x^3 - 3x^2 - 72x + 6 ....for what values of x does this graph have a horizontal tangent...i think there are supposed to be two values
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  2. #2
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    Quote Originally Posted by frozenflames View Post
    So i can't figure out the following:

    f(x) = 2x^3 - 3x^2 - 72x + 6 ....for what values of x does this graph have a horizontal tangent...i think there are supposed to be two values
    set f'(x) = 0 and solve for x.
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  3. #3
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    quadratic...

    excellent i get 4 or -3...

    great, thanks
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