1. (x-y)(a²-b)
2. (a+b)(4-a+5c)
3. (x²-4)(10a-1)
4. (5-c)(-7+5c-5c²)
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Answers & Comments
1. (x-y)(a²-b)
2. (a+b)(4-a+5c)
3. (x²-4)(10a-1)
4. (5-c)(-7+5c-5c²)