Question

Find the coefficient of x4 in the expansion of (1+x)^2 (2+x)^5

Answer 1

Answer:

5

Step-by-step explanation:

Answer 2

Answer:

Step-by-step explanation:

(1+x)^2   (2+x)^5

r=0 0         0

r=1   1         1

r=2   2       2

possibilities are

22

therfore coff of x^4

2c2*5c2

10