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KEAM 2019 Math Paper
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© examsnet.com
Question : 37
Total: 121
The value of
√
7
+
√
7
−
√
7
+
√
7
−
.
.
.
∞
is
2
5
3
1
6
Validate
Solution:
Assuming,
y
=
√
7
+
√
7
−
y
(
y
2
−
7
)
2
=
7
−
y
y
4
−
14
y
2
+
y
+
42
=
0
(
y
−
3
)
(
y
3
+
3
y
2
−
5
y
+
14
)
=
0
∴
y
=
3
© examsnet.com
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