4x2 + 8x + 4 = 4 (x2 + 2x + 1) = 4 (x + 1)2
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2
(x - 5)(x - 3)
(4x - 1)(4x -1) or (4x - 1)2
Take out the common factor, 3: 3x + 6 = 3(x + 2).
If you say that something is "increased by a factor of 8," it just means it was multiplied by 8.