Calculus
posted by Kelly .
find f'(a) for f(x)=1/sqrt(137x)
i got my answer to be 7 / (7(137x)sqrt(137x))
but it says i am wrong
please help

u = 137x
u' = 7
y = u^1/2
y' = 1/2 * u^3/2 * u'
= 7/[2 * (137x)^3/2]
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find f'(a) for f(x)=1/sqrt(137x) i got my answer to be 7 / (7(137x)sqrt(137x)) but it says i am wrong please help