Consider f(x, y) =(ax² + by²). Based on the second derivative test, what are the conditions necessary on D, a and b in order to have a local maximum at (0,0)?

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Q: Suppose f(x,y)=xex. At the point (2,0), in what direction is the directional derivative maximized?

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A: answer is in next step. please give a like !!!

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