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Math Help - Derivative

  1. #1
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    Post Derivative

    To find the derivative of f(x)=x^2-3x+21 at x=4, would you just find the derivative of f(x), which is 2x-3, and plug in 4 for x, to get 5?
    Thanks!
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  2. #2
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    Quote Originally Posted by live_laugh_luv27 View Post
    To find the derivative of f(x)=x^2-3x+21 at x=4, would you just find the derivative of f(x), which is 2x-3, and plug in 4 for x, to get 5?
    Thanks!
    yes ... f'(4) = 5
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