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NCERT Class XI Mathematics - Binomial Theorem - Solutions

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Question : 4
Total: 36
(
x
3
+
1
x
)5
Solution:  
We have, (
x
3
+
1
x
)5
=
5
‌
C0(
x
3
)5 +
5
‌
X1(
x
3
)4(
1
x
) +
5
‌
C2(
x
3
)3(
1
x
)2 +
5
‌
C3(
x
3
)2(
1
x
)3 +
5
‌
C4(
x
3
)(
1
x
)4 +
5
‌
C5(
1
x
)5
=
x5
243
+
5x3
81
+
10x
7
 +
10
9x
+
5
3x3
+
1
x5
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