Question
Asked Oct 9, 2019
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Find the local maximum and minimum values and saddle point(s) of the function. If you have three-dimensional graphing software, graph the function with a domain and viewpoint that reveal all the important aspects of the function. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.)

f(x, y) = 8 − 2x + 4y − x2 − 4y2
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Expert Answer

Step 1

To analyze the given function for and at the critical points

Step 2

The critical points of the given function of x and y are obtained by settting the partial derivatives to be 0. we find that the only critical point is at (x,y) = (-1, 0.5)

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f(x,y)-8-2x+4y-x-4y f(x,y)-2-2x 0, so x = -1; f,(x, y) 4-8y 0,so y 0.5

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Step 3

To analyze further , consider the second partial derivatives. From the general theory, it follows that ...

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f(x,y) 8-2x+4y-x-4y'; r=fy)2= (x, y) = 0,1 = fg (x,y)=-8; Now,r <0, and rt-s =16 > 0; So,f attains its local max imum at f(-1.0.5) 10

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