I can't solve this problem:

We have A(x)= (x-1) (2-x) (6+2x)

a. For which prices of x, A(x)=0

b. Find the prices of x, to give A(x)= is not 0

c. Find the prices of x, to has A(x) a inverse/reverse.

I hope you understand this problem, and solve it.

I am not good in English.