Answer:
n²-7n-21
Explanation:
Given the expression:

First, open the brackets:

Next, bring the like terms together and simplify:

Number 8 is C. I'm still trying to figure out what number 7 is.
(-2,0) option b is the correct answer
An nth degree<span> polynomial can have as many as n real roots.</span>
You didn’t attach a photo can you tell me if there were numbers