factorise the following
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8a^3 -27b^3 -64c^3 - 72 abc
= (2a)^3 + (-3b)^3 + (-4c)^3 - 3×2×(-3)×(-4)
=(2a -3b -4c) {(2a)^2 + (-3b)^2 + (-4c)^2 +6ab
+12bc +8ac)
=(2a - 3b - 4c) (4a^2 +9b^2+ 16c^2 + 6ab +12bc + 8ac).
Hope, it will help you☺️
= (2a)^3 + (-3b)^3 + (-4c)^3 - 3×2×(-3)×(-4)
=(2a -3b -4c) {(2a)^2 + (-3b)^2 + (-4c)^2 +6ab
+12bc +8ac)
=(2a - 3b - 4c) (4a^2 +9b^2+ 16c^2 + 6ab +12bc + 8ac).
Hope, it will help you☺️
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