1.

-18*a*b*c %2B c^3 %2B 8*a^3 %2B 27*b^3

Answer»

8a^3 + 27b^3 + c^3 - 18abc

Using formulaa^3+b^3+c^3–3abc = (a+b+c)(a^2 + b^2 + c^2–ab–bc–ca)

= (2a)^3 + (3b)^3 + c^3 - 3(2a)*(3b)*c

= 4a^2 + 9b^2 + c^2 - 6ab - 3bc - 2ac


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