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August 29, 2015
Posted by **Kelly** on Sunday, October 2, 2011 at 1:47pm.

i got my answer to be 7 / (7(13-7x)sqrt(13-7x))

but it says i am wrong

please help

- Calculus -
**Steve**, Monday, October 3, 2011 at 5:13amu = 13-7x

u' = -7

y = u^-1/2

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

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