Question

(a+b)3=a3+b3+3a2b+3ab2

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

→ (a + b)³

［(a + b)(a + b)］(a + b)

［a(a + b) + b(a + b)］（a + b)

(a² + ab + ab + b²) (a + b)

a ( a² + 2ab + b²) + b(a² + 2ab + b²)

a³ + 2a²b + ab² + a²b + 2ab² + b³

a³ + 3a²b + 3ab² + b³

a³ + b³ + 3a²b + 3ab²

a³ + b³ + 3ab( a + b)

Therefore ......

(a + b)³ = a³ + b³ + 3ab(a + b).

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