Binomial Theorem
Binomial theorem is a theorem developed for calculating any power of any binomial without actually multiplying at length.
General binomial expansion is denoted by
(a+b)n =nc0an +nc1an-1b+nc2an-2b2+…………………..+ncn-1abn-1+ncnbn where n>=0 and
![](https://www.etutorworld.com/wp-content/uploads/2020/04/BT1.jpg)
Example – (x+y)3=3c0x3+3c1x2y+3c2xy2+3c2y3
Example – Expand (p+1)3
(p+1)3=3c0*p3+3c1*p2*1+3c2*p*12+3c2*13
= p3+3p2+3p+1
Some Facts about Binomial Theorem
- General term for an expansion (a+b)n is Tr+1 =ncran-rbr is , where 0 <= r<= n.
- Number of terms in expansion will be n + 1.
Check Point:
Expand the following binomials –
1) (a+b)3
2) (s+3)3
3) (y2+1)4
4) (3+x)4
5) (z+2)6
Answer Key
1) a3+3a2b+3b2a+b3
2) s3+9s2+27s+27
3) y8+4y6+6y4+4y2+1
4) 81+108x+54x2+12x3+x4
5) z6+12z5+60z4+160z3+240z2+192z+64
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