Find the derivative of the function at Po in the direction of A. f(x,y) = - 4xy + y², P (8,4), A = -9i+2j The derivative of f(x,y) at the point Po in the direction of A is (Type an exact answer, using radicals as needed.)

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A: To expand: y-(x-5)2+sin-1xyx+5.

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Q: 2. Derivative of f(x) = - 9x + 4 is: a) 9 b) - 9 c) 4 d) 0

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A: ddxxn=n xn-1

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