每日一题

Mathematics>Standard Multiple Choice

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

If square root (x) = 16, what is the value of square root (4x)?

(A) 16
(B) 32
(C) 64
(D) 128
(E) 256

答案和解析

答案：B

解析：

The expression square root (4x) is equivalent to (square root 4)(square root x), and square root 4 = 2. Since square root x = 16, it follows that square root (4x) = (square root 4)(square root x) = (2)(16) = 32.