Question

Anyone have the answer to this? Need help ASAP?

Answer 1

For this case we have the following data:

Polynomial function of grade 5

Given roots: -2, 2,$4 + i$

Having an imaginary root given by $a + bi$, the other root, in the same imaginary way, must be given by its complex conjugate, that is, $a-bi$.

In this way, the fourth root is given by:

$4-i$

Since the polynomial function is grade 5, it must have 5 roots. Thus, the fifth root must be given by a real number.

Thus, the roots of the polynomial function are given by: three real roots and two imaginary roots.

Answer:

Option D

Answer 2

f(x) has 3 real roots x = -2, x = 2 and x = 4

complex roots occur in conjugate pairs

x = i is a root then x = - i is a root

there are therefore 2 imaginary roots

f(x) has 3 real roots and 2 imaginary roots