Question

Q2. Write the coefficient of y2-in the expansion of (5 - y).*3​

Answer 1

(5-y).y= 5y-y^2
So coefficient of y is 5

Answer 2

Answer: 15

Step-by-step explanation:

(5-y)^3 =(5) ^3 - (y) ^3 - 3×5y(5-y)

=(5) ^3 - (y) ^3 - 75y +15(y)^2