Read the following SAT test question and then click on a button to select your answer.

(a+3)(2a^2-5a+7)

Which of the following is equivalent to the expression above?

A.2a^3-5a+21
B.2a^3+a^2-8a+21
C.2a^3+6a^2-5a+7
D.2a^3+11a^2+22a+21

來源:可可英語 http://www.mermaidtankforrent.com/sat/202007/613494.shtml