Find and classify the stationary point(s) of the following functions: (a) l: R³→ R defined by: 1(x) = x" Ax - 6"x, where: 3 -1 1 2 A = 1 3 1 b : 1 1 -3 8 Is l a quadratic form? (b) m : R²→ R defined...

Extracted text: Find and classify the stationary point(s) of the following functions: (a) l: R³→ R defined by: 1(x) = x" Ax - 6"x, where: 3 -1 1 2 A = 1 3 1 b : 1 1 -3 8 Is l a quadratic form? (b) m : R²→ R defined by: m(x) – af + «} – 2a²u} – 3x2, where a + 0. Make sure to indicate whether the points you find are local or global extreme points.