I need help simplifying/factoring these expressions

10 pts best answer. Please help.

1. Simplify: x(x-1)(x+2)
2. Factor: 2x+12x^3
3. Factor: 5ab – 15abc
4. Factor: 2x^2+ 7x - 4
5. Factor: 9x^2–36

x(x-1)(x+2)=x(x²+x-2)
=x³+x²-2x

2x+12x^3=2x(1+6x²)

5ab – 15abc=5ab(1-3c)

2x^2+ 7x - 4 =(2x-1)(x+4)

: 9x^2–36=(3x+6)(3x-6)