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?
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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