1962 AMC 12 Problem 33

Attempt Problem 33 of the 1962 AMC 12 below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 1962 AMC 12 solutions, or check the answer key.

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33.

The set of xx-values satisfying the inequality 2x152\le|x-1|\le5 is:

4x1-4\le x\le-1 or 3x63\le x\le6

3x63\le x\le6 or 6x3-6\le x\le-3

x1x\le-1 or x3x\ge3

1x3-1\le x\le3

4x6-4\le x\le6

Answer: A
Concepts:absolute valueinequality
Difficulty rating: 1180
Small Hint:

Interpret the inequality as distances from 11 between 22 and 55

Big Hint:

Solve 2x152\le x-1\le5 and 5x12-5\le x-1\le-2

Solution:

For x10,x-1\ge0, the bounds give 3x6.3\le x\le6. For x10,x-1\le0, they give 4x1.-4\le x\le-1. The solution is the union of these two intervals.

Thus, the correct answer is A.

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