42а^2+16a= 2a(21a+8)
8x^4-24x^2 = 8x^2(x^2-3)
12a^5-18a^7= 6a^5(2-3a^2)
36a^4b-12ab^4= 12ab(3a^3-b^3)
-11x^2y^2+22xy= -11xy(xy-2)
-12a^3b^3+6ab=-6ab(2a^2b^2-1)
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Answers & Comments
42а^2+16a= 2a(21a+8)
8x^4-24x^2 = 8x^2(x^2-3)
12a^5-18a^7= 6a^5(2-3a^2)
36a^4b-12ab^4= 12ab(3a^3-b^3)
-11x^2y^2+22xy= -11xy(xy-2)
-12a^3b^3+6ab=-6ab(2a^2b^2-1)