1) ((a+b)²)²=(а²+2ab+b²)² = ((а²+b²)+2ab)² = (а²+b²)²+2(а²+b²)*2ab+4a²b² = a⁴+2a²b²+b⁴+4a³b+4ab³+4a²b² = a⁴+4a³b+6a²b²+4ab³+b⁴
2) ((a-b)²)²=(а²-2ab+b²)² = ((а²+b²)-2ab)² = (а²+b²)²-2(а²+b²)*2ab+4a²b² = a⁴+2a²b²+b⁴-4a³b-4ab³+4a²b² = a⁴-4a³b+6a²b²-4ab³+b⁴
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Answers & Comments
1) ((a+b)²)²=(а²+2ab+b²)² = ((а²+b²)+2ab)² = (а²+b²)²+2(а²+b²)*2ab+4a²b² = a⁴+2a²b²+b⁴+4a³b+4ab³+4a²b² = a⁴+4a³b+6a²b²+4ab³+b⁴
2) ((a-b)²)²=(а²-2ab+b²)² = ((а²+b²)-2ab)² = (а²+b²)²-2(а²+b²)*2ab+4a²b² = a⁴+2a²b²+b⁴-4a³b-4ab³+4a²b² = a⁴-4a³b+6a²b²-4ab³+b⁴