We know that, a 3 + b 3 = (a + b) (a 2 – a × b + b 2 ) Using this formula, we get = (6x) 3 + ( ) 3 = (6x + ) [(6x) 2 – 6x × + ( ) 2 ] = (6x + ) (36x 2 - + )

Factorize:

We know that,

a³ + b³ = (a + b) (a² – a × b + b²)

Using this formula, we get

= (6x)³ + ()³

= (6x + ) [(6x)² – 6x × + ()²]

= (6x + ) (36x² - + )