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I think it's [-X^3/y^(2)] +[8e^(x)]

Yes. it is, but how ? could you show me?

yeah
but give me like 10 15 minutes i'm going to grab something to eat

ok, well you understand that when taking a Sy x is held constant.

yes

okay cool
then what's the derivative of lny?

1/y

x^3 is constant and that would stay on the top correct?
next, What is the derivative of 4y^2

yes

8y

e^x is constant
so, what is Sy?

8e^x

So Ssubyy = -x^3/y^2 + 8e^x?

remember "x" is constant
so if you want plug in 7 for x just so you get use to the idea

sorry yea that's the answer

Ic

Are you in Calc 3 or DE?

No.. just very basic business calc

cant imagine doing the regular calc :(

you have to do partials?

Yes.. now to find the local extreme for max and min in 3D

I have another one.. I just can't do figure out should I post it separate?

sure

I just fan you.. thanks for your help

I tried to post it.. but it got stuck
f(x,y) = x/y = y/x find fxx, fxy, and fyy