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a) 12a-4b= 4*3a-4*b= 4(3a-b)
b) 3xy-6x+9x²=3*xy-3*2x+3*3x² = 3(xy-2x+3x²)
a) 12a- 4b=4(3a- b)
b) 3xy- 6x+ 9x²=3x(y-2+3x)
3)
a) (2a - 3b) + (-2a + 4b ) = -4a^2+8ab+6ab-12b^2= -4a^2+ 14ab-12b^2
b) (x-2) - (4x + 2y - 1) =x-2-4x-2y+2= -3x-2y-3
c) 3(a + 4b - 2) =3x+12b-6
d) 2(x - y ) - 3(x+1) + (y -4)=2x-2y-3x-3+4-4= -x-2y-3