anonymous
  • anonymous
I'm doing rational expressions and need help please! How do you simplify: x+y/x-y divided by 1/x- 1/y. Thanks!
Mathematics
katieb
  • katieb
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Salt
  • Salt
first you find the common denomiator of (1/x)-(1/y) then you flip it and multiply it by x+y/x-y
anonymous
  • anonymous
Can you demonstrate please?
Salt
  • Salt
do you mind if i give you a generic version. I would rather you understand then just give you the answer. Is that ok?

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anonymous
  • anonymous
That would be great
anonymous
  • anonymous
I have gotten to (xy) x+y over (x-y) (y-x) is there anything else I can do?
Salt
  • Salt
ok
Salt
  • Salt
na your done
anonymous
  • anonymous
Thanks for your help!
Salt
  • Salt
the only thing you could do is factor a negative out. and make it x-y squared on the bottom but that isnt necesary
anonymous
  • anonymous
What about if you have 5p/6p? can u cancel the p's?
anonymous
  • anonymous
And also s-1 over (s-1) (s+1) can you cancel the s-1's?
anonymous
  • anonymous
I'm not too sure about the canceling rules...
Salt
  • Salt
which math are you in? If you dont mind me asking.
Salt
  • Salt
ok so the general rule in dividing variables is. if it is the same variable you subtract the exponents.
anonymous
  • anonymous
Oh im in algebra 2
anonymous
  • anonymous
Ok got that
anonymous
  • anonymous
So could u cancel the p's or s-1's?
Salt
  • Salt
what is the exponent of the p's and x-1's?
anonymous
  • anonymous
I guess it is just one because the exponents canceled out earlier
Salt
  • Salt
what is anything raised to the 0 power except 0^0
Salt
  • Salt
for instance what is x^0?
anonymous
  • anonymous
is it one?
Salt
  • Salt
yep
anonymous
  • anonymous
But they are not to the oth power!
Salt
  • Salt
really? If (x-4)^1/(X-4)^1=(X-4)^0 then (x-4)^0=1
Salt
  • Salt
just to give you a hint i am a math tutor my statements are meant to lead you somewhere i am not asking you questions for no reason lol
anonymous
  • anonymous
ok thats cool, im still confused tho!
Salt
  • Salt
okok
Salt
  • Salt
um
Salt
  • Salt
so x^2/X^2 you subtract the exponenets leaving you with x^0 right?
anonymous
  • anonymous
ok
Salt
  • Salt
can you do (x-4)^2/(x-4) for me?
Salt
  • Salt
treat the x-4 as one thing and just worry about the exponenets
anonymous
  • anonymous
(x-4) (x-4)/(x-4) equals x-4?
Salt
  • Salt
exactly
Salt
  • Salt
what you just did was the subtracted the exponenets. do you understand what i mean?
anonymous
  • anonymous
YES! Hooray, so that should mean you can cancel the p's and the s-1's?
Salt
  • Salt
what do you think?
Salt
  • Salt
I am only saying that because i want you to be confident.
anonymous
  • anonymous
I think it is a yes......
Salt
  • Salt
im ok with that =)
Salt
  • Salt
sorry this took so long i really want you to understand it
anonymous
  • anonymous
Thank u for taking the time to help me! I really appreciate it 8 )
Salt
  • Salt
no problem. I like this place. i will probably hang around, so if you have more questions feel free to ask.
anonymous
  • anonymous
Haha im sure i will! nite
Salt
  • Salt
nite

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