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RRB Junior Engineer Stage 1 Model Papers 4
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© examsnet.com
Question : 11
Total: 99
If
x
=
2
+
√
3
,
y
=
2
−
√
3
, then the value of
x
2
+
y
2
x
3
+
y
3
is
7
38
7
40
7
19
7
26
Validate
Solution:
x
=
2
+
√
3
,
y
=
2
−
√
3
x
+
y
=
4
,
x
y
=
4
−
3
=
1
x
2
+
y
2
x
3
+
y
3
=
(
x
+
y
)
2
−
2
x
y
(
x
+
y
)
3
−
3
x
y
(
x
+
y
)
=
16
−
2
64
−
3
×
4
=
14
52
=
7
26
© examsnet.com
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