(A) To find the value of the polynomial $p(x) = x^{2} - 7x + 12$ at $x = 3$,we substitute $3$ for $x$ in the expression:$p(3) = (3)^{2} - 7(3) + 12$$p

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(A) To find the value of the polynomial $p(x) = x^{2} - 7x + 12$ at $x = 3$,we substitute $3$ for $x$ in the expression:$p(3) = (3)^{2} - 7(3) + 12$$p(3) = 9 - 21 + 12$$p(3) = 21 - 21$$p(3) = 0$Therefore,the value of the polynomial at $x = 3$ is $0$.