
Re: Simplifying Algebraic Expressions with Subtracted Expressions
Posted:
Nov 25, 2013 12:49 PM


Yet again, don't use the implication symbol in place of the equality symbol (or vice versa which I too often see as well) and advise the first that explain EQUALITY by use of the distributive law. And again, sharpen up your language, you don't "solve" an expression by simplifying it or, as in this case, expressing it in a LESS simplified form in order to explain why something works. But, even if the expression reduces to a constant, you have not "solved it", you've merely express it in a different, much simpler, form. Teachers are teaching with every word they speak, mathematically good, mathematically accurate but awkward, even mathematically wrong.
Wayne
At 06:21 PM 11/11/2013, MVTutor wrote: >How would you advise students in the example "1(x+23)"? >Can I tell them to drop the parentheses and reverse the signs of each term? >Is the explanation that if we change the subtraction to an addition >we can use the associative property of addition? >Are there alternative methods? >I've seen one book that suggests solving it as follows: >1(x+23) => 1+ 1(x+23)=> then solve 1(x+23) > 1(x)+1(2) (1)(3) >but this seems a bit confusing to me. >Any suggestions? >Thanks, John

