
Re: Simplifying Algebraic Expressions with Subtracted Expressions
Posted:
Nov 13, 2013 10:54 AM


At this stage, bad advice. Once the story has been expressed mathematically, algebraic manipulations should be carried out independent of the story with the final mathematical simplification or solution, as appropriate, reinterpreted in terms of the story. Change all subtractions to addition and divisions to multiplication so that the key properties  associative, commutative, and distributive  can be applied with impunity; i.e., "merely an abstract game of simplification".
Wayne
At 01:27 AM 11/13/2013, Jonathan Crabtree wrote: >What is the story the expression describes? If the word problem >involves subtraction, I suggest keeping the subtraction. If it's >merely an abstract game of simplification, then you may place a >superscript  before the term to denote negativity and then proceed >with the usual laws.

