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Math Help - Need help with this differentiation question

  1. #1
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    Need help with this differentiation question

    Can anyone help me figure this out?


    If f(7)=6 , f ' (7)=9 , g(7)=10 , and g ' (7)=7 then:

    (f+g) ' (7) =

    (fg) ' (7) =

    thanks
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  2. #2
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    Hello,
    Quote Originally Posted by coldfire View Post
    Can anyone help me figure this out?


    If f(7)=6 , f ' (7)=9 , g(7)=10 , and g ' (7)=7 then:

    (f+g) ' (7) =

    (fg) ' (7) =

    thanks
    Using basic rule of differentiation, (f+g)'(x)=f'(x)+g'(x)

    Using multiplication rule : (fg)'(x)=f'(x)g(x)+f(x)g'(x)

    .... !
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  3. #3
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    ahhh, so simple.. I forgot (fg)' = f'(x)g(x) + g'(x)f(x)

    thanks
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