Answer:

Step-by-step explanation:
A quadratic expresion is of the form

where

The give options are:




From the given options, the only expression which is quadratic is

where a =5, b=9 and c=-1
Therefore the correct choice is the second option.
The answer is f(x) = -2(0.7)^x that is the correct answer, I just did the question and got it right.
Check on this website
file:///C:/Users/nadim/Downloads/Lesson%207%20Problem%20Set.pdf