Question 427614
Answer:You have to apply the well known formula: {{{(a-b)^2=a^2-2ab+b^2}}}

Where a=3x and b=2y.

{{{(3x-2y)^2=(3x)^2-2*3x*2y+(2y)^2}}}

{{{(3x-2y)^2=9x^2-12xy+4y^2}}}

Done.