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b) 4x³ y + 16 x⁴ y³ - 2x⁴ y = 2x³y (2 +8 y² - y)
c) 3wxy - 2 wz + 7w² y z² = w(3 xy - 2z + 7w y z²)
d) ab - 6a²b² + 9a 3b³ = ab(1 - 3ab +27 b²)
e) 6x² + 12 x⁴ = 6x²(1 + 2x²)
f) y² - 4y³- y⁵ = y²( 1 - 4y - y³)