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Math Help - My expression

  1. #1
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    My expression

    For the following expression I am trying to find

    a) dy/dx
    b) d^2y/dx^2 [also denoted f" (x)]

    y = 2x^3 + 6x^2 -9x + 10

    Answers:

    a) I have found 2x^2 + 4x - 3
    Do I have to go further than this?


    For part b I have no real clues

    Thanks.
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  2. #2
    MHF Contributor
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    The answer for a) should be f'(x) = 6x^2 + 12x - 9.

    For b), just take the derivative of f'(x).
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  3. #3
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    brilliant thanks a lot!

    What does the derivative mean though?
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  4. #4
    MHF Contributor
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    The derivative of a function y = f(x) is \frac{dy}{dx} = f'(x). Some notation you may also have seen is \frac{d}{dx}f(x).
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  5. #5
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    Quote Originally Posted by IronMan View Post
    brilliant thanks a lot!

    What does the derivative mean though?
    it can also be seen as the slope of the original equation.
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