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Math Help - Functions

  1. #1
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    Thumbs down Functions

    I got these questions wrong in my test. Can someone explain this to me please???
    f(x)-->(3x-2)/(x+2)

    Find f '(x)

    Find f '(2)

    f:x-->2x+5, g:x-->(1/2)x

    Find f(g:x)

    Find g(f:x)
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  2. #2
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    Re: Functions

    Quote Originally Posted by terone71 View Post
    I got these questions wrong in my test. Can someone explain this to me please???
    f(x)-->(3x-2)/(x+2)

    Find f '(x)

    Find f '(2)

    f:x-->2x+5, g:x-->(1/2)x

    Find f(g:x)

    Find g(f:x)
    show what you did and someone may be able to spot your mistake(s) , if any.

    also, what does the notation f:x indicate ?
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  3. #3
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    Re: Functions

    That is what I don't know. It came in the test but the teacher didn't teach this because he left the school without completing the syllabus. Please teach it....
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  4. #4
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    Re: Functions

    the first question involves calculus ... taking the derivative of a rational function f(x) using the quotient rule, then evaluating the value of that derivative f'(x) at x = 2, f'(2).

    I believe the second function involves function composition.

    I recommend you google the above topics and research how to do them yourself.
    Thanks from terone71
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