SAT数学Problem Solving练习题（6）

>>SAT考试：SAT数学Problem Solving练习题（6）

>>SAT考试辅导：精品课程高端指导

Question 6: f(x) = 1/(x + 1) and g(x) = x + 1. What are the values of x for which f(x) = g(x)?

(a) x1 = 0 and x2 = 2

(b) x1 = 0 and x2 = 1

(c) x1 = 2 and x2 = -2

(d) x1 = 0 and x2 = -2

(e) x1 = 1 and x2 = -2

Answer: f(x) = g(x) means x + 1 = 1/(x + 1);

(x + 1) · (x + 1) = 1;

x2 + 2 · x = 0

x · (x + 2) = 0 so x1 = 0 and x2 = -2.

(d) is the correct answer.

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