How do i get this equation like what's the base formula? (#5)

This is the sum of two cubes. We have x^3 which is x cubed and 64 which is 4 cubed.

The base formula is:

(a+b)(a^2+ab+b^2)

In case case a = x and b = 4.

There is a similar case where you are finding the difference between two cubes. The formula for it is:

(a-b)(a^2+ab+b^2)

Ithink if im not mistaking b is -3 but im not a 100% sude