Question

write the coefficient of y2 in the Expression of (y-1) 3 :- ​

Answer 1

Answer:

Step-by-step explanation:

(a - b)³ = a³ - 3a²b + 3ab² - b³

(y-1)³ =

(y)³ - (3) (y²) (1) + (3) (y) (1²) - (1)³

= y³ - 3y² + 3y - 1

∴ coefficient of y² in (y - 1)³ will be -3

Hope it help you :)