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Answer:
Explanation:
f(x)=x^(2)-6x+9
use the formula a^2 - 2ab + b^2 = (a-b)^2 to factor the expression
f(x)= x^2 - 2x3 + 3^2 ( a = x, b = 3 )
f(x) = (x-3)^2 (perfect square)