Question

the coefficient of x^3 in 3x^3+x^2-x+1​

Answer 1

Answer:

3

Step-by-step explanation:

coefficient is the number before x^3

here it is 3 ...........

Answer 2

Answer:

Tr+1=nCran−rbr

Applying to the above question we get

Tr+1=(−1)r10Crx20−2r310−r3−rx−3r

=(−1)r10Crx20−5r310−3r ...(i)

For the coefficient of x−15

20−5r=−15

35=5r

r=7

Substituting in (i) we get

T8=−10C7x−153−4

=−10C3x−153−4

=−3!3410.9.8

=27−40