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(-18a³b - 6a²b² + 4ab³) ÷ 2ab
Take out common factor 2ab:
= 2ab(-9a² - 3ab + 2b²) ÷ 2ab
Divide 2ab by 2ab:
= -9a² - 3ab + 2b²
Take out factor -1:
= -(9a² + 3ab - 2b²)
Factorise:
= -(3a - b)(3a + 2b)
Answer: -(3a - b)(3a + 2b)
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