Math, asked by azeemkwtuddin, 10 months ago

what is the coefficient of the xpower 3 in 7​

Answers

Answered by Imtiyaz0101
0

Answer:

Explanation:

for integers the binomial expansion is

(x+y)n=xn+nC1xn−1y+nC2nn−2y2+....nCkxn−kyk+.....yn

where nCk=n!k!(n−k)!

for  (x−3)7

the term including  x5

7C2x5(−3)2

=7!2!(5!)×9

=(7×6×5!2×5!)×9

=21×9=189

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