Answer:

Explanation:
Zeros of a function:
Given a polynomial f(x), this polynomial has roots
such that it can be written as:
, in which a is the leading coefficient.
Zeros of −5, 4i, and −4i
This means that
. So




Since



Has a value of 40 when x=3
We use this to find a, which means that we have
. So



So
