Grade 10Algebra
Please find the r-1 term & r*1term for(a-b)n in expansion
Please find the r-1 term & r*1term for(a-b)n in expansion
1 Answer
Vikas TU
The general term for the binomial expansion (x +a)^n is given as:
Tr+1 = nCr xn-r ar
Now put r → r-2 for r-1 term
and replace x to a and a to -b
U will get,
nCr-2 (an-r+2) (-b)r
Now same for rth term put r to r+1
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