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1.) (2a+b)² = (2a+b)(2a+b) = 4a² + 2ab + 2ab + b² = 4a² + 4ab + b²
2.) (2a+b)³ = (2a+b)²(2a+b) = (4a²+4ab+b²)(2a+b) = 8a³ + 4a²b + 8a²b + 4ab² + 2ab² + b³
= 8a³ + 12a²b + 6ab² + b³
3.) (2a+b)⁴ = (2a+b)²(2a+b)² = (4a²+4ab+b²)(4a²+4ab+b²)
= 16a⁴ + 16a³b + 4a²b² + 16a³b + 16a²b² + 4ab³ + 4a²b² + 4ab³ + b⁴
= 16a⁴ + 32a³b + 24a²b² + 8ab³ + b⁴
4.) (a+2b)² = (a+2b)(a+2b) = a² + 2ab + 2ab + 4b² = a² + 4ab + 4b²
5.) (a+2b)³ = (a+2b)²(a+2b) = (a²+4ab+4b²)(a+2b) = a³ + 2a²b + 4a²b + 8ab² + 4ab² + 8b³
= a³ + 6a²b + 12ab² + 8b³
6.) (a+2b)⁴ = (a+2b)³(a+2b) = (a³+6a²b+12ab²+8b³)(a+2b)
= a⁴ + 2a³b + 6a³b + 12a²b² + 12a²b² + 24ab³ + 8ab³ + 16b⁴
= a⁴ + 8a³b + 24a²b² + 32ab³ + 16b⁴
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