Question

At how many points the given cubic polynomial (x+1)(x+3)x intersects with y-axis?

Answer 1

Step-by-step explanation:

f(x)=x^3 −1

it intersect x-axis if

f (x) = 0

x^3

−1= 0

(x−1)(x^2+x+1)=0

⇒(x−1)=0 or (x^2+x+1)=0

⇒x=1 because (x^2+x+1)=0 has no real roots.