If that's - 8x - 5, the answer is (2x + 1)(2x - 5). If that's + 8x + 5, it gets ugly in a hurry.
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4x2 + 8x + 4 = 4 (x2 + 2x + 1) = 4 (x + 1)2
If that's + 80, the answer is -4(x + 5)(x - 4)
Take out the common factor, 3: 3x + 6 = 3(x + 2).
(x + 3)(4x + 5)
(x - 5)(x - 3)