1.

(1) (20 + 6)” - (20 -

Answer»

a^3-b^3=(a –b) (a^2 + ab + b^2)hence(2a+b)^3-(2a-b)^3=(2a+b-2a+b)((2a+b)^2+(2a+b)(2a-b)+(2a-b)^2)=2b(4a^2+4ab+4a^2-b^2+4a^2+b^2-4ab)=2b(12a^2)=24a^2b



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