Cubic Functions Derivatives

Hello all, i need assistance with these, thanks

1.) Find a cubic function whose graph touches the x-axis at x = -4, passes through the origin and has a value of 10 when x = 5.

2.) The function f(x) = 2x^3 + ax^2 - bx +3. When f(x) is divided by x - 2 the remainder is 15 and f(1) = 0

A.) Calculate the values of a and b

B.) Find the other two factors of f(x)

3.) The polynomial P(x) = x^3 + ax^2 + bx - 9 has zeros at x = 1 and x = -3. The values of a and b are?

Please guys, full working out and answer, me be stupid :P

this isnt homework, its revision so you dont have to worry about me cheating. THANKS!