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Calculus

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find f'(a) for f(x)=1/sqrt(13-7x)

i got my answer to be 7 / (7(13-7x)sqrt(13-7x))
but it says i am wrong

please help

  • Calculus - ,

    u = 13-7x
    u' = -7

    y = u^-1/2
    y' = -1/2 * u^-3/2 * u'

    = 7/[2 * (13-7x)^3/2]

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