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Math Help - derivative problem with e^x

  1. #1
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    derivative problem with e^x

    y= e ^ 5- (2/x) ............ whats the derivative? for some reason i cant find the answer!!


    thanks!
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  2. #2
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    Quote Originally Posted by I"love"mymathteacher View Post
    y= e ^ 5- (2/x) ............ whats the derivative? for some reason i cant find the answer!!


    thanks!
    y=e^{5-\frac{2}{x}}

    Use the chain rule. Whenever a composite function looks complicated like this, just introduce a variable. Let u=5-\frac{2}{x}. So now y=e^u. So now use the chain rule \frac{dy}{dx}=\frac{dy}{du}\frac{du}{dx}. I'll let you try to finish this, we aren't really suppose to just give answers around here. Reply with what you think the answer is, if you're still stuck, I will help you finish it.
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