(a) k : R³→ R defined by: k (x) = x" Ax + b, %3D where: 3 -1 1 A = –1 3 1 1 1 -3 and b = 2. Is k (x) a quadratic form? (b) l : R²→ R defined by: 1(x) = x1e¬#1(x% – 4r2). Are any of the stationary points of l(x) global extrema? Why/why not?

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