a^3(x+y)^2-4a^3c^2

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a^3(x+y)^2-4a^3c^2a^3(x+y)^2-4a^3c^2a^3(x+y)^2-4a^3c^2a^3(x+y)^2-4a^3c^2=a^3[(x+y)^2-4c^2)]=a^3(x+y-

a^3(x+y)^2-4a^3c^2
a^3(x+y)^2-4a^3c^2

a^3(x+y)^2-4a^3c^2
a^3(x+y)^2-4a^3c^2
=a^3[(x+y)^2-4c^2)]
=a^3(x+y-2c)(x+y+2c)