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= 18m (m - n) (m + n)
= 18m (m² - n²)
= 18m³ - 18m.n²
2) 24a²b - 12b + 36 = 12 (a²b - b + 3)
3) 8xy² + 6x²y = 2xy (4y + 3x)
4) (5a - 3b) (5a - 3b) = (5a - 3b)²
= 25a² - 30ab + 9b²