We are going to use the F.O.I.L Method for this expansion,
FIRST
2x*x = 2x2
OUTSIDE
2x*3 = 6x
INSIDE
-4x*x = -4x
LAST
-4*3 = -12
Now to add up all the terms we have found
2x2+6x-4x+12 = 2x2+2x+12
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