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SSC CGL Tier-1 06-09-2016 Solved Paper
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© examsnet.com
Question : 58
Total: 100
If 5x +
1
x
= 10, then
x
2
+
1
25
x
2
is equal to
2
1
5
3
1
5
3
3
5
2
3
5
Validate
Solution:
5x
+
1
x
= 10
On dividing by 5,
x +
1
5
x
= 2
On squaring both sides,
(
x
+
1
5
x
)
2
= 4
⇒
x
2
+
1
25
x
2
+ 2x ×
1
5
x
= 4
⇒
x
2
+
1
25
x
2
= 4 -
2
5
=
20
−
2
5
=
18
5
= 3
3
5
© examsnet.com
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