f(x, y, z, w) = a cosz+acosy+acosz+acos w+zy+yz+zw which is a function of four variables, and it has a critical point at x=y=z=w = 0 (this is obvious; you do not need to verify it). (A) Classify the critical point, assuming a = 0. (B) Classify the critical point, assuming a = 1/2. (C) Classify the critical point, assuming a = 1.

Q: Let f(x, y) = 4x² + 8x − y + 3y² − 2xy. List the critical point:

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Q: Find the zeros of Q(x) = 5x - x² + 9 using the quadratic formula. Number of zeros: one

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