Evaluate x(-9)+2y when x=4, y=-1
2 answers:
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Answer:
The first 3 terms in the expansion of , in ascending power of x are,
coefficient of in the expansion of
= (240 - 192) = 48
Step-by-step explanation:
=
= + terms involving higher powers of x
= + terms involving higher powers of x
so, the first 3 terms in the expansion of , in ascending power of x are,
Again,
=
Now, by inspection,
the term comes from k =5 and k = 6
for k = 5, the coefficient of is ,
= -192
for k = 6 , the coefficient of is,
= 240
so, coefficient of in the final expression = (240 - 192) = 48