NCERT Class XI Mathematics - Linear Inequalities - Solutions

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Question : 15
Total: 65
x
4
<
(5x2)
3
-
(7x3)
5

Solution:  
The inequality is
x
4
<
(5x2)
3
-
(7x3)
5

Multiplying each term by the L.C.M. of 4, 3, 5, i.e., by 60, we get
15x < 100x – 40 – 84x + 36
or, 15x < 100x – 84x – 40 + 36 or, 15x < 16x – 4
Tranposing 16x to L.H.S., we get 15x – 16x < – 4 or – x < – 4
Multiplying both sides by –1, we get x > 4
∴ The solution is (4, ∞).
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