(a-3b)³

Certainly! To calculate the expression (a-3b)³, we can use the formula for the cube of a binomial, which is (a - b)³ = a³ - 3a²b + 3ab² - b³.

Applying this formula to our expression (a-3b)³, we get:

(a-3b)³ = a³ - 3a²(3b) + 3a(3b)² - (3b)³ = a³ - 27a²b + 27ab² - 27b³

So, the cube of the expression (a-3b) is a³ - 27a²b + 27ab² - 27b³.