Respuesta :

Answer:

9m^2 - 12mn + 4n^2

Step-by-step explanation:

Answer:

9m²-12mn+ 4n²

Step-by-step explanation:

First you expand it so

(3m-2n)(3m-2n)

9m²-6mn-6mn+4n²

9m²-12mn+ 4n²

And this is the simpliest form , hope this helped:))