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-2w4 + 1250
-2(w4 - 625)
-2(w4 - 54)
-2(w2 - 52)(w2 + 52)
-2(w - 5)(w + 5)(w2 + 52)
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a4 + 3a3 + 27a + 81
a3(a+3) + 27(a+3)
(a+3)(a3+27)
(a+3)(a3+33)
(a+3)(a+3)(a2+ac+b2)
(a+3)2(a2+ac+b2)
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x8 - 16x4
x4(x4 - 16)
x4(x2 - 4)(x2 + 4)
x4(x - 2)(x + 2)(x2 + 4)
Edwin