Answer:
The zeroes of the given polynomial f(x) are

Step-by-step explanation:
Given : Quadratic function 
To find : What are the zeros of the quadratic function?
Solution :
Using quadratic formula of the general equation
to get the roots is 
Comparing the given quadratic equation,
a = 8, b = -16 and c = - 15.
Substitute the value in the formula,

Therefore, The zeroes of the given polynomial f(x) are
