Question

show that (a+b)³= a³+ b³+ 3ab(a+b)​

Answer 1

Step-by-step explanation:

(a+b)³=(a+b)(a²+2ab+b²)

(a+b)³=(a³+b³+3a²b+3b²a)

(a+b)³=a³+b³+3ab(a+b)

Answer 2

(a+b)³=(a+b)²x(a+b)

=a²+2ab+b²(a+b)

=a³+a²b+2a²b+2ab²+ab²+b³

=a³+b³+3a²b+3ab²

=a³+b³+3ab(a+b)