Question

Find the coefficient of: x4 in (2x + 5)8​

Answer 1

Step-by-step explanation:

Co-efficient of x4 is 1120

Explanation:

(x+2)8=x8+nc1x7⋅21+nc2x6⋅22+nc3x5⋅23+nc4x4⋅24+..............+28

Co-efficient of x4 is nc4⋅24=8!4!⋅4!⋅16=70⋅16=1120[Ans]

Answer 2

Answer:

8

8 is not having any variable thats why 8 is coefficent