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Standard VII
Mathematics
(a + b)^2 Expansion and Visualisation
Question
If
x
2
+
1
x
2
=
7
, then the values of
x
+
1
x
is
5
6
2
3
A
5
B
6
C
2
D
3
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Solution
Verified by Toppr
Given,
x
2
+
1
x
2
=
7
Since,
(
x
+
1
x
)
2
=
x
2
+
1
x
2
+
2.
x
.
1
x
=
x
2
+
1
x
2
+
2
=
7
+
2
=
9
∴
x
+
1
x
=
3
.
Option B is correct.
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