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y^2+5y-24
y^2+y*8-3y-24
= (y-3)(y+8)
2.-
n^2-4n+4
(n-2)(n-2)
= (n-2)^2
3.-
2(8x-65+x^2)
2(x^2+8x-65)
= 2(x-5)(x+13)