Find the cube of:

a + 2

(a + 2)³

Using the formula,

(x + y)³ = x³ + y³ + 3x²y + 3xy²

= (a)³ + (2)³ + 3 $\times$ (a)² $\times$ (2) + 3 $\times$ (a) $\times$ (2)²

= a³ + 8 + 6a² + 12a

Hence, (a + 2)³ = a³ + 8 + 6a² + 12a