Let the function f be given by f(x) = x ? 5x + 9x ? 4 and A = 1 -1 0 2 3 -1

Let the function f be given by f(x) = x³ ? 5x² + 9x ? 4 and A = 1 -1 0 2 3 -1 -1 0 1 Show that A satisfies f(x) = 0. (HINT: Show that A³ -5A² +9A-4I?=0.)