Two variable extreme value problem

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SUMMARY

The discussion centers on understanding the notation and calculation of mixed partial derivatives in the context of extreme value problems in multivariable calculus. Specifically, the term "f base xy" refers to the mixed partial derivative of a function with respect to x and y, calculated by first differentiating with respect to x while holding y constant, and then differentiating the result with respect to y while holding x constant. An example provided is the function f(x,y) = 3x² + 2xy, where the mixed partial derivative f base xy is computed as 2. This clarification is essential for solving extreme value problems involving functions of two variables.

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Homework Statement


alright so this is just a general question. In order to solve an extreme value problem, there's a part where I have to use f base xy. I'm not quite sure what that is, I know f base x is the partial derivative of the function with regards to x, and f base xx is the second partial derivative for x.


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The Attempt at a Solution


The only thing I can think of is that f base xy is simply the original function of x and y. Thanks in advance
 
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F base xy means differentiate with x while keeping y constant, then take the rest and differentiate with respect to y keeping x constant.
example:
f(x,y)= 3x^2+2xy
f(x,y)x = 6x+2y
f(x,y)xy = 2
 
ok you that makes sense. I guess I must have missed the class where we learned that lol. Thanks.
 

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