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Mathematics>Standard Multiple Choice

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

If (t-2)^2 = 0, what is the value of (t+3)*(t+6)?

(A) 40
(B) 18
(C) 9
(D) 4
(E) It cannot be determined from the information given.

答案和解析

答案：A

解析：

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