Question: Question 4 Let f(x, y) = x 2 + y 2 .

Question 4 Let f(x, y) = x2 + y2. <-------- square root the whole bold numbers

(a). Explain why f is differentiable at the point (3, 4).

(b). Find a linear approximation for f(x, y) near (3, 4), and use it to approximate the number

2.992 + 4.022. <---------- square root the whole bold numbers

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