Question

How do you express one half of the difference of a number cubed and one?

Answer 1

(1/2)(n^3 - 1)

Explanation:

Let the number be n. Then "a number cubed" less 1 is n^3 - 1 (same as "difference of a number cubed and one).

Half of this result is (1/2)(n^3 - 1)