
#1
Sep904, 04:09 PM

P: 2

If you can work this out please try and reply to it before friday the 10th!!!
#1: If f is a differentiable function and g(x) = xf(x), use the definition of a derivative to show that g'(x)(g prime of x) = xf'(x)+f(x)(xf prime of x plus f of x). Definition of a Derivative: The Derivative of a function f at a number a, denoted by f'(a) (f prime of a), is: Lim f(a + h)  f(a)
x > 0  h 



#2
Sep904, 04:27 PM

Sci Advisor
HW Helper
P: 3,149

Apply the definition directly to g(x).




#3
Sep1404, 12:47 PM

P: 2

Thanks a lot, I found/got the right answer



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