Description
Problem 27.1: (6.5 #33. Introduction to Linear Algebra: Strang) When A and
B are symmetric positive definite, AB might not even be symmetric, but its eigenvalues are still positive. Start from ABx = λx and take dot products with Bx. Then prove λ > 0.
Problem 27.2: Find the quadratic form associated with the matrix .
Is this function f (x, y) always positive, always negative, or sometimes positive and sometimes negative?
