Question

Please who know only they will give solution.If don't know please don't give wrong solutions. question no. 5.please give right solution. I will make your answer as a brain list answer. BUT THE ONLY CONDITION IS GIVE WRITE SOLUTION AND ANSWER. THANK Ü.

Answer 1

consider
2x=A and 5y=B
now thw eqn becomes
(A-B)^3-(A+B)^3 therfore the formula is 
-2b(b^2+3a^2)
=-2(5y){25y^2+3(4x^2)}
=-10y{25y^2+12x^2}
=-250y^3-120x^2y