Answer:
1) D. 
2) E. The coefficient of  is -16.
 is -16.
Step-by-step explanation:
1) A polynomial is an algebraic expression of the form  , where
, where  is the grade of the polynomial. In this case, the only equation that satisfies this definition is:
 is the grade of the polynomial. In this case, the only equation that satisfies this definition is: 

Correct answer: D
2) Let  , we proceed to expand the expression by algebraic means:
, we proceed to expand the expression by algebraic means:


We see that coefficients for  and
 and  are -16 and 0, respectively. Hence, the incorrect answer is E.
 are -16 and 0, respectively. Hence, the incorrect answer is E.