Mathematics
8 Online
OpenStudy (anonymous):
what is the simplified form of x/2 divided by 4/2x
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OpenStudy (ivettef365):
when you divide fractions, you switch the second fraction and multiply, so you have
x 2x
----- x ------
2 4
OpenStudy (anonymous):
so itll be 4x/4x ? i multiplied
OpenStudy (ivettef365):
when you multiply (x)(2x) = ???
OpenStudy (ivettef365):
to multiply is NOT crossing
OpenStudy (anonymous):
or 2x^2/8 ? which will equal x^2/4 ?
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OpenStudy (ivettef365):
good job
OpenStudy (anonymous):
thanks, so when do you cross multiply ?
OpenStudy (anonymous):
with an equation like this
OpenStudy (ivettef365):
you cross multiply when you have a proportion, it would look like this
just an example
x 2x
----- = ------
2 4
OpenStudy (anonymous):
ohhh thanks
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OpenStudy (ivettef365):
the equal sign is telling you is a proportion then you cross multiply
OpenStudy (anonymous):
yea yea, i see.
OpenStudy (ivettef365):
yw :)
OpenStudy (anonymous):
how do i ask another question on this website lol ?
OpenStudy (ivettef365):
just ask me
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OpenStudy (anonymous):
oh alright, ummm. What is the simplified form of 3/x-2/y divided by 3/x+2/y
OpenStudy (ivettef365):
can you write it in a better format ??
OpenStudy (anonymous):
3 2 3 2
--- - --- divided by --- + ---
x y x y
OpenStudy (ivettef365):
ok, first lets do the subtraction, so you have
3 2 3y-2x
---- - ----- = ------
x y xy
OpenStudy (ivettef365):
do you understand what I did ??
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OpenStudy (anonymous):
how did the top get " 3y-2x" and the bottom got "xy" ?
OpenStudy (ivettef365):
ok, same as when you add a fraction, common denominator (xy)
so you have
3(y) -2(x)
_____________
xy
OpenStudy (anonymous):
so you crossed multiplied ? to get "3y" ? and "2x" ?
OpenStudy (ivettef365):
when you add a fraction, and you have
9 3 9(3) - 3(4)
----- - ---- = --------------
4 3 (4)(3) (common denominator 12)
OpenStudy (ivettef365):
you see it ?
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OpenStudy (anonymous):
yea i see it , sorta lol
OpenStudy (ivettef365):
ok so lets do the other fraction, you have
3 2 3y + 2x
---- + ---- = ------------
x y xy
OpenStudy (ivettef365):
are you with me
OpenStudy (anonymous):
yup
OpenStudy (ivettef365):
ok so you have fractions
3y - 2x 3y+2x
-------- divided by ----------
xy xy
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OpenStudy (anonymous):
yes, now how would you divid that ?
OpenStudy (anonymous):
divide*
OpenStudy (ivettef365):
now switch the second fraction so you have
3y - 2x xy
--------- x -----------
xy 3y + 2x
OpenStudy (ivettef365):
yes that is what I meant divide
OpenStudy (ivettef365):
do you know how to multiply this ??
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OpenStudy (anonymous):
no not really, sorry
OpenStudy (ivettef365):
before you multiply you need to simplify, what is on the top and bottom can cancel, so what is the same on top an bottom??
OpenStudy (anonymous):
the x and the y
OpenStudy (ivettef365):
ok, so now you going to have the following
3y-2x 1
------ x --------
1 3y+2x
OpenStudy (ivettef365):
now you can multiply, what do you get?
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OpenStudy (anonymous):
3y-2x
-----
3y+2x
OpenStudy (ivettef365):
good job
OpenStudy (anonymous):
thankssss
OpenStudy (ivettef365):
yw :)
OpenStudy (anonymous):
i have more questions lol