(2x - 4) (2x²+3x-5) (3b-2) (2b + 3)

1. 4x3+6x2-10x-8x2-12x+20
= 4x3-2x2-22x+20

2. 6b2+9b-4b--6 =6b2+5b-6

1.(2x - 4) (2x²+3x-5)
=4x³+6x²-10-8x²-12x+20
=2x³+6x²-8x²-12x-10+20
=4x³-2x²-12x+10

2.(3b-2) (2b + 3)
=6b²+9b-4b-6
=6b²+5b-6

^_^^_^(^^)(^^)