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b) 3x² + 27x=3x(x-9)
c) x³ - 5x²=x²(x-5)
d) x³ - 9x=x(x²-9)
e) - 2x⁴ + 4x²=2x(-1+2x)
f) x³ + 4x² + 4x=x(x²+4x+4)