Answer :

To find : coefficients of x7 and x8


Formula :


Here, a=2,


We have,




To get a coefficient of x7, we must have,


x7 = xr


• r = 7


Therefore, the coefficient of x7


And to get the coefficient of x8 we must have,


x8 = xr


• r = 8


Therefore, the coefficient of x8


Conclusion :


• coefficient of x7


• coefficient of x8


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