SOLUTION: I been working on these problems and I still having a problem with the answers. Please Help! Problem 1. 9/r-8/9/r+8 Problem 2.r^2-4/r^2-4r+4 Problem 3. 10/y-5/10/(y-5)^2 Problem

Algebra ->  Rational-functions -> SOLUTION: I been working on these problems and I still having a problem with the answers. Please Help! Problem 1. 9/r-8/9/r+8 Problem 2.r^2-4/r^2-4r+4 Problem 3. 10/y-5/10/(y-5)^2 Problem       Log On


   

Question 192959: I been working on these problems and I still having a problem with the answers. Please Help! Problem 1. 9/r-8/9/r+8 Problem 2.r^2-4/r^2-4r+4 Problem 3. 10/y-5/10/(y-5)^2 Problem 4.Find all numbers for which the radional expression is undefined.2/v-5
Found 2 solutions by jim_thompson5910, Alan3354:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
I'll do the first two to get you headed in the right direction


%289%2F%28r-8%29%29%2F%289%2F%28r%2B8%29%29 Start with the given expression.


%289%2F%28r-8%29%29%28%28r%2B8%29%2F9%29 Multiply the first upper fraction by the reciprocal of the second lower fraction.


%289%28r%2B8%29%29%2F%289%28r-8%29%29 Combine the fractions.


%28highlight%289%29%28r%2B8%29%29%2F%28highlight%289%29%28r-8%29%29 Highlight the common terms.


%28cross%289%29%28r%2B8%29%29%2F%28cross%289%29%28r-8%29%29 Cancel out the common terms.


%28r%2B8%29%2F%28r-8%29 Simplify


So %289%2F%28r-8%29%29%2F%289%2F%28r%2B8%29%29=%28r%2B8%29%2F%28r-8%29 where r%3C%3E-8 or r%3C%3E8


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# 2

%28r%5E2-4%29%2F%28r%5E2-4r%2B4%29 Start with the given expression


%28%28r%2B2%29%28r-2%29%29%2F%28r%5E2-4r%2B4%29 Factor the numerator


%28%28r%2B2%29%28r-2%29%29%2F%28%28r-2%29%28r-2%29%29 Factor the denominator


%28%28r%2B2%29highlight%28%28r-2%29%29%29%2F%28highlight%28%28r-2%29%29%28r-2%29%29 Highlight the common terms.


%28%28r%2B2%29cross%28%28r-2%29%29%29%2F%28cross%28%28r-2%29%29%28r-2%29%29 Cancel out the common terms.


%28r%2B2%29%2F%28r-2%29 Simplify


So %28r%5E2-4%29%2F%28r%5E2-4r%2B4%29=%28r%2B2%29%2F%28r-2%29 where r%3C%3E2

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
If a problem is ambiguous, not clearly stated, it is on the site for a LONG LONG time. It is likely to become one of the group that eventually gets pushed out the bottom.
Use some parentheses and try again.