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August 1, 2014

August 1, 2014

Posted by **Z32** on Tuesday, April 13, 2010 at 10:03pm.

I got the derivative which is -1/x^2 + 1/(5-x)^2 but I don't know how to get the answer. The answer is y=4/5 but I was wondering how do you get that?

- Calculus -
**Reiny**, Tuesday, April 13, 2010 at 10:20pmYou did not state what the function is , but from your derivative I deduced it had to be

y = 1/x + 1/(5-x) + C

setting your derivative equal to zero

1/(5-x)^2 = 1/x^2

(5-x) = x^2

25 - 10x + x^2 = x^2

x = 2.5

sub that back into y = (your equation) and you should get y = 4/5

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