# Structure in expressions challenge

Review your skills for using the structure of expressions with some challenge problems.

### Problem

The volume (in cubic meters), v, of a rectangular room is given by the expression:
v, equals, 7, b, start superscript, 4, end superscript, minus, 28
Where b is a positive integer and each dimension is a positive integer too. What are three unique expressions that could represent the dimensions of the room ?
In the answer box, write these three expressions as a product that equals the volume (e.g. "(expression 1)(expression 2)(expression 3)").