We know that, a 3 + b 3 = (a + b) (a 2 – a × b + b 2 ) Using this formula, we get = (5a) 3 + ( ) 3 = (5a + ) [ (5a) 2 – 5a × + ( ) 2 ] = (5a + ) (25a 2 - + )

Factorize:

We know that,

a³ + b³ = (a + b) (a² – a × b + b²)

Using this formula, we get

= (5a)³ + ()³

= (5a + ) [ (5a)² – 5a × + ()²]

= (5a + ) (25a² - + )