Answer:
The expression ' one-half difference of a number cubed and one'. is written as 
Step-by-step explanation:
Given : Expression ' one-half difference of a number cubed and one'.
To find : How do we express the expression ?
Solution :
Let the number be 'x'.
A number cube is 
Difference of a number cubed and one is 
One-half difference of a number cubed and one is represent as,

Therefore, the expression ' one-half difference of a number cubed and one'. is written as 