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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