Posted by Bllly on Tuesday, August 4, 2009 at 11:39pm.
please help me to simplify this expression:
2/y^23y+2 + 7/y^21

algebra  drwls, Wednesday, August 5, 2009 at 1:14am
Do you mean
2/(y^23y+2) + 7/(y^21) ?
1/(y1) can be factored out of both terms. That leaves you with
[1/(y1)][2/(y2) + 7/(y+1)]
That is not much simpler, however.
You could create a common denominator with the second bracketed term, but that won't simplify it much, either. 
algebra  MathMate, Wednesday, August 5, 2009 at 8:23am
Please take care when transcribing questions involving fractions. All numerators and denominators have implicit parentheses around them, so when put onto a single line, they are necessary. An omission will change the value of the expression.
For example:
1/4x+3 is not the same as 1/(4x+3) because without parentheses division is done before addition. 
algebra  julie, Tuesday, July 6, 2010 at 11:20pm
(x+5)over 6= 1 (x+5) over 7
(x+5)/6= 1 (X+5)/7
I know you have to get a CD of 42 but I can't get the write answer.