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b) x⁴-3x²+x=x(x³-3x+1)
c) x²-25=x²-5²=(x+5)(x-5)
d) 8a²-2b²=2(4a²-b²)
e) 36x²-81y²=(6x)²-(9y)²=(6x+9y)(6x-9y)
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