Answer
$(2x-3)^2$
Work Step by Step
Rewrite the expression:
$4x^2-12x+9=(2x)^2-2(2x)(3)+3^2$
Use the square of a binomial formula: $(a-b)^2=a^2-2ab+b^2$:
$(2x)^2-2(2x)(3)+3^2=(2x-3)^2$
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