Question

${(a+b)}^{3}-8{(a-b)}^{3}$​

Answer 1

(a+b)³ - 8(a-b)³

a³+b³+3a³b+3ab²-8(a³-b³-3a²b+3ab²)

a³+b³+3a³b+3ab²-8a³+8b³+24a²b-24ab²

-7a³+9b³+27a²b-21ab²