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Math Help - Differentiating some functions.

  1. #1
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    Differentiating some functions.

    Hi guys, I have got some questions which i am unable to solve despite trying for so long. Would appreciate if someone would enlighten me

    Differentiate the following:

    1) y= a -x (My answer was 2a-2x but the given answer is -2x)
    2)f(x)=x (4x-2) ( My answer was 24x -16x but given was 12x -4x)
    3) x.√1+x

    Thank you in advance
    Last edited by mr fantastic; December 7th 2011 at 02:09 AM. Reason: Re-title, full question put in main body of post.
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  2. #2
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    Re: Some algebra question (Differentiation)

    Quote Originally Posted by Lownavin View Post
    Hi guys, I have got some algebra question which i am unable to solve despite trying for so long. Would appreciate if someone would enlighten me

    1) y= a -x (My answer was 2a-2x but the given answer is -2x)
    2)f(x)=x (4x-2) ( My answer was 24x -16x but given was 12x -4x)
    3) x.√1+x

    Thank you in advance
    1. a is a constant.

    2. Try expanding the function first.

    3. Use the product and chain rules.
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