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2. 4a (5 + 2b)
3. 7a^2 (a-3)
4. a^2(a^3 - 1)
5. 5a^4 (3a^2 + 2)
2. 4(5a+2ab)
3. 7a^2(a-3)
4. a^2(a^3-1)
5. 5a^4(3a^2+2)