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a2-a-20
(a+4)(a-5)
Wiki User
a2+9a+20 = (a+4)(a+5) when factored
( a2 ) ( a2+1 )
2a3 - 128 = 2*(a3 - 64) = 2*(a -4)*(a2 + 4a + 16)
(x + 5) (x - 4)