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Math Help - Calc Derivative Question

  1. #1
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    Calc Derivative Question

    Hey! How do you find the derivative of the following using the first derivative principles?

    a) f(x)=7/x-x
    b) f(x)=(x+1)^1/2
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by Sculthorp View Post
    Hey! How do you find the derivative of the following using the first derivative principles?

    a) f(x)=7/x-x
    b) f(x)=(x+1)^1/2
    use the formula, there are two, the usually used as far as i can see is

    f'(x) = \lim_{h \to 0} \frac {f(x + h) - f(x)}h

    Hint: for the second problem, multiply by the conjugate of the numerator over itself to simplify

    can you finish?
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  3. #3
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    Thanks for the help! The problem is with the 7/x-x I get 7/0 which is not possible right? So.... is this not possible to get the derivative?
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  4. #4
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    I don't think the function is \frac{7}{x-x} ... most probably it's \frac{7}{x} - x
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