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2001 p2 q2


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#1 jon2005

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Posted 07 May 2006 - 01:46 PM

A curve has equation y=x- 16\rootx

Find the equation of the tangent at the point where x=4


Can normally do these questions no bother, I'm guessing there's a problem with my differentation somewhere if someone could walk me through the steps it would be appreciated.

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Posted 07 May 2006 - 04:10 PM

change the equation so its not something over something

eg ... y=x- 16x^-1/2 (x- 16x(to the power negative 1/2))

and then differentate it from there
sub in x=4 and off you go!

hope that helped!
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