NCERT Class XI Mathematics - Binomial Theorem - Solutions

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Question : 3
Total: 36
(2x3)6
Solution:  
We have, (2x3)6 = [2x+(3)]6
=
6
C0(2x)6
+
6
C1(2x)5(3)
+
6
C2(2x)4(3)2
+
6
C3(2x)3(3)2
+
6
C4(2x)2(3)4
+
6
C5(2x)(3)5
+
6
C6(3)6

= 1(64x6)+6(32x5)(3) + 15(16x4)(9)+20(8x3)(27) + 15(4x2)(81) + 6(2x)(243)+1(729)
= 64x6576x5+2160x44320x3 + 4860x3+4860x2 - 2916x + 729
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