According to the fundamental theorem of algebra which polynomial function has exactly 8 roots

option A is correct

Step-by-step explanation:

The number of roots a polynomial has is a factor of the exponent to which it’s highest power is raised

What we are saying here is that the number of roots a polynomial has is equal to the exponent on its highest power

That is why for example a quadratic equation has 2 roots

Now, to get 8 roots, the highest exponent should be 8

After expansion, the first polynomial has a term in the 8th power so it is our answer

The second polynomial, although we have a term in x^4 but it is raised to another 4 which is totally raised to 16 and that cannot be our answer

The correct answer here is the first polynomial

(a) the volume of the cone is 20/3 in3

hence, option a is correct.