-(x+y)²+16(x-1)²
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-(x+y)²+16(x-1)²
-(x+y)²+16(x-1)²
-(x+y)²+16(x-1)²
-(x+y)²+16(x-1)²
=16(x-1)²-(x+y)²
=(4x-4+x+y)(4x-4-x-y)
=(5x+y-4)(3x-y-4)
(4(x-1)+x+y)(4(x-1)-(x-y))
(4x-4+x+y)(4x-4-x+y)
(5x-4+y)(3x-4+y)