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Anonymous
16x2 + 8x + 1 - 9y2 = (4x + 1)2 - (3y)2 which is a difference of two squares.
= (4x + 1 + 3y)*(4x + 1 - 3y)
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(4x - 3y + 1)(4x + 3y + 1)
(7x-11)(11+7)
The GCF is 8x.
(4x+1)(4x-3)
2x(8x-7)
x2-8x+15 = (x-3)(x-5)
No because the discriminant is less than zero.