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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I think that wants to be 16x2 - 40xy + 25y2 That factors to (4x - 5y)(4x - 5y) or (4x - 5y)2
24x4 + 16x² - 8 = 8(3x4 + 2x² - 1) = 8(x² + 1)(3x² - 1).
The GCF is 8.
If that's -16x, that factors to (x - 8)(x - 8) or (x - 8)2
The GCF is 2x.