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b. a²b + 2ab²-abc = ab(a+2b-c)
c. 15a²b - 10a²c + 5a =5a(3ab-2ac+1)
d. 4x²y - 6xy³ =2xy(2x-3y²)
e. 9m² - 16 =9m² - 16
f. a² - 8a + 16 = (a-4)(a-4)
g. x² - xy + y² =. x² - xy + y
h. 3y² - 8y + 4 =(3y-2)(y-2)
i. 6x² + 5xy - 6y² =(2x+3y)(3x-2y)
j. 8a² + 2ab - 15b² =(4a-5b)(2a+3b)