Hi,

you can factor the term of the function completely:

f(x) = (x² - 1)(1 - x/2) = (x - 1)(x + 1)(x - x/2)

A product equals zero if one of the factors is zero. Therefore solve for x;

x + 1 = 0 or x - 1 = 0 or 1 - x/2 = 0. You'llget the zeros: -1, 1, 2

I've attached the graph of the function.

EB