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[1]. (4a - 3b)³
= 1.(4a)³ + 3.(4a)²(- 3b) + 3.(4a)(- 3b)² + 1.(- 3b)³
= 64a³ - 144a²b + 108ab³ - 27b³
[2]. (2y² + y)³
= 1.(2y²)³ + 3.(2y²)²(y) + 3.(2y²)(y)² + 1.(y)³
= 8y⁶ + 12y⁵ + 6y⁴ + y³
[3]. (3a - 2)⁵
= 1.(3a)⁵ + 5(3a)⁴(- 2) + 10(3a)³(- 2)² + 10(3a)²(- 2)³ + 5(3a)(- 2)⁴ + 1.(- 2)⁵
= 243a⁵ - 810a⁴ + 540a³ - 720a² + 240a - 32