Question

Expand: (2x-3y)² and 4x²-81² and 8x³-27y³

Answer 1

hey u can use formula

(a-b)^2=a^2+b^2-2ab

Answer 2

Answer:

Step-by-step explanation

formula,

(a-b)² = a²- 2ab +b²

(a² - b²) = (a+b)(a-b)

(a³ - b³) = (a-b)(a² + ab + b²)