Mathematics > Standard Multiple Choice

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

If , what is the value of ?

(A) 40

(B) 18

(C) 9

(D) 4

(E) It cannot be determined from the information given.

答案见下一页>>>

The correct answer is A

Explanation

Since (t-2)^2 = (t-2)(t-2) = 0, it follows that t-2 = 0, and so t = 2. Therefore, (t + 3) times (t+6) = (2+3)(2+6) = 5*8 = 40.