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(3x-2)(3x-2y+1)-4x(2x-3y+1)=
( 3x - 2)( 3x - 2y + 1) - 4x ( 2x - 3y + 1) = =9x²-6xy +3x - 6x+4y -2 - 8x² +12xy - 4x = x² +6xy-7x +4y - 2
9x²-6xy+3x-6x+4y-2-8x²+12xy-4x=
x²+6xy-7x+4y-2
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( 3x - 2)( 3x - 2y + 1) - 4x ( 2x - 3y + 1) =
=9x²-6xy +3x - 6x+4y -2 - 8x² +12xy - 4x =
x² +6xy-7x +4y - 2
(3x-2)(3x-2y+1)-4x(2x-3y+1)=
9x²-6xy+3x-6x+4y-2-8x²+12xy-4x=
x²+6xy-7x+4y-2