SAT数学Problem Solving练习题(42)
- 2017年07月27日14:00 来源:互联网
- 参与(0) 阅读(4907)
以下是小站SAT频道为大家整理了SAT数学Problem Solving练习题(42),供考生们参考,以下是详细内容。
Question 42: If f(x) = |x| and g(x) = x2, how many solutions has f(x) = g(x)?
(a) 1
(b) 2
(c) 3
(d) 4
(e) The equations does not have real solutions.
Answer: The simplest way to solve this problem is to draw the 2 functions in the x, y plane.
We find that the 2 functions intersect in 3 locations, for x = -1, 0 and 1.