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Thread: HELP!! Find f(x) for the given function...

  1. #1
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    HELP!! Find f(x) for the given function...

    Find f(x) for the given function f and simplify as much as possible
    $\displaystyle
    f(x)=x^3-2x^2+20$

    I'm really, really rusty...just started precalculus this fall and I can't remember how to do this (with the $\displaystyle x^3$...what is it called again?)
    Thank you in advanced!
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  2. #2
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    You already have $\displaystyle f(x)$, so you must be looking for something else. If it's the derivative of f(x), remember the power rule: $\displaystyle \frac{d}{dx} x^n = nx^{n-1}$. And the derivative of a sum of terms is the sum of the derivatives of each of the individual terms.
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  3. #3
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    Quote Originally Posted by icemanfan View Post
    You already have $\displaystyle f(x)$, so you must be looking for something else. If it's the derivative of f(x), remember the power rule: $\displaystyle \frac{d}{dx} x^n = nx^{n-1}$. And the derivative of a sum of terms is the sum of the derivatives of each of the individual terms.
    OH! I misinterpreted the question. Thank you, this is much easier than I thought it was, haha.
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