Consider the f(x, y) = x2 + y2 – a. For what values of a do we have – McqOptions

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1.	Consider the f(x, y) = x2 + y2 – a. For what values of a do we have critical points for the function.
A.	independent of a
B.	for any real number except zero
C.	a ∊ (0, +∞)
D.	a ∊ (-1, 1)
Answer» B. for any real number except zero

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