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a3 - 2a2 + 4a - 8 = a2(a - 2) + 4(a - 2) = (a - 2)(a2 + 4)
5a3-45a=-2a2+18 5a(a2-9)=-2(a2-9) 5a=-2 a=-2/5
a2(2a2-21a+49) a2(2a-7)(a-7)
2a2 - 13a + 15 = (2a - 3) (a - 5)
2a2