A polynomial f(x) of degree 3 MUST have three linear factors. In this question, the polynomial f(x) of degree 3 has x^2 - 1 as factor. This factor is actually a difference of two squares, so using the difference of squares identify we obtain two linear factors (x-1) and (x+1). To get the last factor, we carry out the Euclidean division f(x) / (x^2 - 1).‪@EndzeMathsSolutions-mp1wn‬