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16x2-8x+1 16: -4*-4=16 -4+-4=-8

16x2-4x-4x+1

|..........|..|.....|

|..........|..|......1

|..........|...2*2x

|.........2*2x

2*2*2*2xx

4x(4x-1)+1(4x-1)

Answer: (4x-1)(4x+1)

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15y ago

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