Question: 8.9 Consider the quadratic function f(x) = xQx . Show that f(x) is convex on a set Q C R if and only if (v

8.9 Consider the quadratic function f(x) = xQx . Show that

f(x) is convex on a set Q C R" if and only

8.9 Consider the quadratic function f(x) = xQx . Show that f(x) is convex on a set Q C R" if and only if (v - x)Q(y - x) 20

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