Rewrite 4×2 as (2x)2.
Rewrite 9 as 32.
Check the middle term by multiplying 2ab and compare this result with the middle term in the original expression.
Factor using the perfect square trinomial rule a2-2ab+b2=(a-b)2, where a=2x and b=-3.
Factor by Grouping 4x^2-12x+9