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2. -5a^4 - 40a^4b + 25a^3b^2
maaf ya kalau salah..
= -6p²q+8pq²+14a²q
2. -5a² (2a²+8a²b-5ab²) = -5a²×2a² -5a²×8a²b -5a²×-5ab²
= -10a² - 40a pangkat 4 b +25 a pangkat 3 b²