Find the coefficient of x in the expansion of (1 – 3x + 7x2) (1 – x)16.
To Find : coefficient of x
Formula :
We have a formula,
Therefore, expansion of (1-x)16 is given by,
Now,
Multiplying the second bracket by 1 , (-3x) and 7x2
In the above equation terms containing x are
and -3x
Therefore, the coefficient of x in the above expansion
=-16-3
=-19
Conclusion : coefficient of x =-19