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x^2-3x+2x-6
=x^2-x-6
b) (2x-3) (x+4)
2x^2+8x-3x-12
=2x^2+5x-12
c) (3m+2n) (3m-2n)
9m^2-6mn+6mn-4n^2
=9m^2-4n^2
d) (3-a) (5+a)
15+3a-5a-a^2
=15-2a-a^2
e) (2+a) (a^2-2a+1)
2a^2-4a+2+a^3-2a^2+a
2a^2-2a^2-4a+a+2+a^3
-3a+2+a^3
=a^3-3a+2