NCERT Class XI Mathematics - Linear Inequalities - Solutions
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Question : 12
Total: 65
Solution:
The inequality is
(
+ 4 ) ≥
( x − 6 ) or ,
(
) ≥
( x − 6 )
Multiplying both sides by 30,
3(3x + 20) ≥ 10(x – 6) or, 9x + 60 ≥ 10x – 60
Transposing 10x to L.H.S. and 60 to R.H.S., we get
∴ 9x – 10x ≥ – 60 – 60 or –x ≥ –120
Multiplying both sides by –1, we get x ≤ 120
∴ The solution is (–∞, 120].
Multiplying both sides by 30,
3(3x + 20) ≥ 10(x – 6) or, 9x + 60 ≥ 10x – 60
Transposing 10x to L.H.S. and 60 to R.H.S., we get
∴ 9x – 10x ≥ – 60 – 60 or –x ≥ –120
Multiplying both sides by –1, we get x ≤ 120
∴ The solution is (–∞, 120].
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