NCERT Class XI Mathematics - Linear Inequalities - Solutions

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Question : 55
Total: 65
- 15 <
3(x2)
5
≤ 0
Solution:  
- 15 × 5 <
3(x2)
5
× 5 ≤ 0 × 5 [Multiplying by 5]
⇒ –75 < 3(x – 2) ≤ 0
75
3
< x - 2 ≤
0
3
[Dividing each side by 3]
⇒ –25 < x – 2 ≤ 0
or –25 + 2 < x – 2 + 2 ≤ 0 + 2 [Adding 2]
⇒ –23 < x ≤ 2
Hence, x is less than or equal to 2 and greater than –23, i.e., x ∈ (–23, 2]
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