Question

(a+b)³=a³+ b³+3ab(a+b)

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

To prove: (a+b)³=a³+ b³+3ab(a+b)

Proof:

(a+b)³=(a+b)(a+b)²

         =(a+b)(a²+b²+2ab)

         =a(a²+b²+2ab)+b(a²+b²+2ab)

         =a³+b²a+2a²b+a²b+b³+2ab²

         =a³+3a²b+3ab²+b³

         =a³+b³+3ab(a+b)