The ulterential of f(x,y) at the point (1,1,3). (d) use to approximate the change in f(x,y)...

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The ulterential of f(x,y) at the point (1,1,3). (d) use to approximate the change in f(x,y) as x changes from x = 1 to x - 1.

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Answer 1

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f(a,y) = x²y + x² - y2 - 24 +3 © at - aay tax = 2xlytu y = 32-**-2 = 72-7-2 - for critical points put. So foto then 22 (4+1)= fax = 2 19+1) (by eah) fay = 2x (by eah) fyy = -1 (by eah). D = fan fyy-fry D - 215+1)x-1 - 4x² D = - [ 4x² +24+2] i fos (0 -

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