Répondre :
(a +b)³=(a+b)(a+b)²
=(a+b)(a²+2ab+b²)
=a³+2a²b+ab²+a²b+2ab²+b³
=a³+3ab²+3a²b+b³
A=(2x + 4)³
=(2x)³+3(2x)4²+3(2x)²4+4³
=8x³+48x²+96x+64
=(a+b)(a²+2ab+b²)
=a³+2a²b+ab²+a²b+2ab²+b³
=a³+3ab²+3a²b+b³
A=(2x + 4)³
=(2x)³+3(2x)4²+3(2x)²4+4³
=8x³+48x²+96x+64