0When we have to expand a binomial like (a+b)2. Then we do the following steps:
- Since 2 is the exponent the value of n is 2. The value of the 1st term is Tr+1 where r =0.
- So the binomial coefficient is
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which expands to n!/n-r!r! Since the value of r in the 1st term is 0. it will be 2!/2-0!0!=2/2X0!. Since the value of 0! is 1 it will be equal to 1.
Then to caluculate the 1st term we also have to multiply the binomial coefficient with an-r br =a 2-0 b0=a2
So, the 1st term will be 1X a2
