Answer:
[tex](2x+3)^{2}[/tex]
Step-by-step explanation:
Factor the equation (I got 36 because I multiplied 4x9)
You need to find two numbers that multiple to equal 36 but add to equal 12
6 x 6 = 36
6 + 6 = 12
I used to box method to factor it further into (2x+3)^2