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Somebody want to help with this derivative:

y = (7.75x

I differentiate it with the quotient rule and get:

dy/dx = 31x / 1500 - 3 / x

But that's wrong. It's got a zero around 5 - 6 and the original function has its minimum at (4.03, 1.12). Not sure what I did wrong.

y = (7.75x

^{3}+ 2250) / 750xI differentiate it with the quotient rule and get:

dy/dx = 31x / 1500 - 3 / x

^{2}But that's wrong. It's got a zero around 5 - 6 and the original function has its minimum at (4.03, 1.12). Not sure what I did wrong.

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