Question

$a ^ 3 + b ^3 - 2ab \: =$
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Answer 1

Answer:

a^3 + b^3 -2ab

Step-by-step explanation:

a^3+b^3 -2ab= (a+b)(a^2+b^2-ab) -2ab

= (a+b){(a+b)^2 -3ab}-2ab

= (a+b)^3 -3ab(a+b) -2a

= (a+b)^3 -a(3ab+3b^2+2)

= (a+b)^3 -a{b(3a+3b)+2}

I hope it will help you.

(a^2+b^2 = (a+b)^2 -2ab) this I have used in answer