Question 1202674
First, perform any operations possible within groupings.

{{{ (3x -2y + 3x + Y) ( 6x -5 y + 8y - 4x)}}}

{{{(6x-2y+Y)(2x+3y)}}}

Next you could use distributive property, IF YOU WANT TO, or could choose to
use a lattice method for multiplication.

<pre>
            6x    -2y     Y
          ------------------------
    2x   | 12x^2  -4xy    2xY
         |
    3y   | 18xy  -6y^2   3yY
</pre>
Combine like-terms using addition.
{{{12x^2+18xy-4xy-6y^2+2xY+3yY}}}


{{{highlight(12x^2+14xy-6y^2+2xY+3yY)}}}-------or other variations based on commutative property for addition.