Parsing algebraic expressions is always a pain ... The second parse returns a full expression to produce: (2+(4*2)). If that was too fast, read the post which has a nice flowchart and an example ...

National 5 Maths factorising an algebraic expression. revision-guideNational 5 Maths factorising an algebraic expression Revise how to factorise an algebraic expression with our National 5 maths ...