Question

If the constant term in the expansion of
$(x - \frac{9}{x ^{3} } ) ^{8}$
is 112 find a.​

Answer 1

Answer:

(1+x)

10

(

x

1

+1)

12

=

x

(

12)

1

(1+x)

22

T

r+1

=

22

C

r

x

r−12

Hence the term independent of x will be the constant term.

r−12=0

⇒r=12

Hence the 13

th

term from the starting will be the constant term.

Therefore

The corresponding binomial coefficient

=

22

C

12

Step-by-step explanation:

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