Assignment:
Mr. Pinto is a Web designer. He is trying to put 4 characters on a page. The space occupied by character 2 takes 5 units more than character 1, character 3 takes 7 units less than the character 2, and character 4 takes the same space as that taken by character 2.
a. Find the total space occupied by all the characters in an algebraic expression.
b. Comment on the kind of factors of the simplified algebraic expression.