The figure shows the graph of the equation F(x, y. 2) = x² + y - 2 – 16x – 142 – 4 = 0 Use the quadratic formula to solve for z as a function of x and y. (Use symbolic notation and fractions where needed.) 22 = Calculate using the formula z = f(x, y) (for both choices of sign) and again via implicit differentiation. Verify that the two answers agree. (Use symbolic notation and fractions where needed. Give your answer using z in the answer.)

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