Question

find the intercepts of the polynomial x^3+3x^2-x-3

Answer 1

x^3+3x^2-x-3=
x^3-x+3x^2-3=
x(x^2-1)+3(x^2-1)
=(x+3)(x^2-1)

so x=1 , -1 ,-3

Answer 2

thanks!