Page 39 - Math SL HB Sem 1

BNO\1L\L THEORE\{

The lomtula above can be simplilied:

t\ \\" \''rl :' f rrl.1-.,,,, _1
; \\'hete h --

r", 1. i''b I",b it ,
i i h'- .*nbnl+bn)
I i ,l ,,.1i t.

\ I I {n)l- n(n _ | t b ... n(n-l)...{n r +7l
2t rl b'
Ln I
- - - Lru )

Example I :
"+4y)
Write the expansion of ( 3

I

i
I

I

Example 2
i
I Find rhe coefficient ofr in rhe expansion of 2x - I ..tii

i
i

I

I
j