Decide for or against the positive definiteness of these matrices, and write out the
Chapter 6, Problem 6.1.2(choose chapter or problem)
Decide for or against the positive definiteness of these matrices, and write out the corresponding f = x TAx: (a) " 1 3 3 5# . (b) " 1 1 1 1 # . (c) " 2 3 3 5# . (d) " 1 2 2 8 # . The determinant in (b) is zero; along what line is f(x,y) = 0?
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