Simplyfy:(5a+3b)^3+(5a-3b)^3

1.	Simplyfy:(5a+3b)^3+(5a-3b)^3
Answer» We know that (a+b)^3 + (a-b)^3=(a^3+3a^2.b+3ab^2+b^3+a^3-3a^2.b+3ab^2-b^3=2(a^3+3ab^2)So .(5a+3b)^3 + (5a-3b)^3=2{(5a)^3 + 3(5a)(3b)^2}=2{125a^3 + 135ab^2)=250a^3 + 270ab^2.

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