The volume (in cubic meters), $v$, of a rectangular room is given by the expression: $v = 7b^4-28$ 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)").** [[☃ expression 1]]