A
B
C
D
Explanation
Correct answer: B.
Choice B is correct. Multiplying by each term of the polynomial within the second pair of parentheses gives ; ; ; ; ; ; and . Adding these seven expressions together and combining like terms gives , which can be simplified to .
Desmos solution:
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice A
Choice A is incorrect and may result from incorrectly identifying the highest power of in the expressions or incorrectly combining like terms.
Choice C
Choice C is incorrect and may result from incorrectly identifying the highest power of in the expressions or incorrectly combining like terms.
Choice D
Choice D is incorrect and may result from incorrectly identifying the highest power of in the expressions or incorrectly combining like terms.