Mughil S.

asked • 03/06/17

In the binomial expansion (a+x)^n where n>4, the coefficient of x^3 is twice that of x^4. Show that n=2a+3

In the binomial expansion (a+x)^n where n>4, the coefficient of x^3 is twice that of x^4.
 
1) Show that n=2a+3
 
In the same expression, the coefficient of x^2 is 3/2 time the coefficient of x
 
2) Obtain another relationship between n and a. Hence find the value of n and a
 
3) State the constant term in the expansion
 

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