Find the coefficient of x2 in the expansion of How to obtain the value of 'r' can any one tell - Maths - Binomial Theorem

Question

Find the coefficient of x2 in the expansion
of
How to obtain the value of 'r' can any one tell me plzz

S. Usha Rani · Accepted Answer

Tr+1=nCrxn-rarPut x= 12 and a= x;
n=10Tr+1=10Cr1210-rxr=10Cr1210-rxr2Since we want x2coeffcient we
need to dor2=2r=4T4+1=10C41210-4x42=210*164x2=10532x2

Find the coefficient of x2 in the expansion of.How to obtain the value of 'r' can any one tell me plzz......

Find the coefficient of x² in the expansion of.How to obtain the value of 'r' can any one tell me plzz......