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What is the solution set of this inequality?

[tex]\[ 1 \ \textless \ |x-2| \ \textless \ 5 \][/tex]

[tex]\[
(-3, \ \square) \cup (\square, \ 7)
\][/tex]


Sagot :

To solve the inequality [tex]\(1 < |x - 2| < 5\)[/tex], we need to break it down into two parts:

1. [tex]\(1 < |x - 2|\)[/tex]
2. [tex]\(|x - 2| < 5\)[/tex]

Let's deal with each part separately.

### Part 1: [tex]\(1 < |x - 2|\)[/tex]
An absolute value inequality of the form [tex]\(1 < |A|\)[/tex] translates to two separate inequalities:
[tex]\[ A < -1 \quad \text{or} \quad A > 1 \][/tex]

For [tex]\(1 < |x - 2|\)[/tex], this means:
[tex]\[ x - 2 < -1 \quad \text{or} \quad x - 2 > 1 \][/tex]

Solving these separately:

- [tex]\(x - 2 < -1\)[/tex]
[tex]\[ x < -1 + 2 \implies x < 1 \][/tex]

- [tex]\(x - 2 > 1\)[/tex]
[tex]\[ x > 1 + 2 \implies x > 3 \][/tex]

So, the solution set for this part is:
[tex]\[ x < 1 \quad \text{or} \quad x > 3 \][/tex]

### Part 2: [tex]\(|x - 2| < 5\)[/tex]
An absolute value inequality of this form translates to:
[tex]\[ -5 < x - 2 < 5 \][/tex]

Solving this inequality:
Add 2 to all parts of the inequality:
[tex]\[ -5 + 2 < x < 5 + 2 \][/tex]
[tex]\[ -3 < x < 7 \][/tex]

### Combine the Solutions
We need the values of [tex]\(x\)[/tex] that satisfy both conditions simultaneously. The first condition gives [tex]\(x < 1\)[/tex] or [tex]\(x > 3\)[/tex], and the second condition states [tex]\(-3 < x < 7\)[/tex].

- For [tex]\(x < 1\)[/tex], it must also lie within [tex]\(-3 < x < 7\)[/tex], hence [tex]\( -3 < x < 1 \)[/tex].
- For [tex]\(x > 3\)[/tex], it must also lie within [tex]\(-3 < x < 7\)[/tex], hence [tex]\( 3 < x < 7 \)[/tex].

So, combining these intervals, the solution set of the inequality [tex]\(1 < |x - 2| < 5\)[/tex] is:
[tex]\[(-3, 1) \cup (3, 7)\][/tex]

Therefore, the correct answer in each box is:
[tex]\[ (-3, 1) \cup (3, 7) \][/tex]