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Thread: The Derivative

  1. September 15th 2008, 08:13 PM #1
    VX-1
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    The Derivative

    If f(x)=x+6, compute f(3) and f'(3).

    Can someone show me how to do this?
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  2. September 15th 2008, 08:19 PM #2
    11rdc11
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    Quote Originally Posted by VX-1 View Post
    If f(x)=x+6, compute f(3) and f'(3).

    Can someone show me how to do this?
    just plug in 3 for x in the function and then plug in 3 for x in the derivative.
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  3. September 15th 2008, 08:47 PM #3
    VX-1
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    Sorry I didn't clarify-- how would I go about figuring out the derivative in the second one?

    Would f'(3)=1+6=7 ?
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  4. September 15th 2008, 08:51 PM #4
    11rdc11
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    Use the power rule

    nx^p = pnx^{p-1}

    n being a constant, so your derivative

    f'(x)=1
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