SAT数学Problem Solving练习题(18)
- 2017年07月25日14:26 来源:互联网
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Question 18: What is the value of integer a, if x = 2 is a solution of the equation √(a + x) = 2·x?
(a) a = 10
(b) a = 12
(c) a = 14
(d) a = 16
(e) a = 18
Answer: If we square the equation we get a + x = 4·x2
By replacing x with 2, a + 2 = 4·22, so a + 2 = 16.
In conclusion, a = 14.