Mathematics
8 Online
OpenStudy (anonymous):
please help :)
simplify. x/(4x) + x^2
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OpenStudy (luigi0210):
I feel like I've done this problem so many times D:
OpenStudy (anonymous):
@Luigi0210 (x do you know the answer?
OpenStudy (luigi0210):
\[\frac{ x(1) }{ x(4+x) }=\frac{ 1 }{ 4+x }\]
OpenStudy (luigi0210):
I'm not giving the answer directly :P
OpenStudy (anonymous):
@Luigi0210 bleh.. confused
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OpenStudy (anonymous):
@phi @ash2326 help?
OpenStudy (luigi0210):
well you have to factor out an x, and then since they have the same factors you can cancel them out
OpenStudy (luigi0210):
D:
:(
OpenStudy (anonymous):
@Luigi0210 1/4??
OpenStudy (luigi0210):
@Jhannybean help me out here
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OpenStudy (anonymous):
@.Sam. @Luigi0210 help me out?
sam (.sam.):
\[\frac{x}{4x+x^2}\]
Factor x from denominator
\[=\frac{x}{x(4+x)}\]
cancel x
\[=\frac{\cancel x}{\cancel x(4+x)} \\ \\ =\frac{1}{4+x}\]
OpenStudy (luigi0210):
I tried explaining it :/
OpenStudy (anonymous):
@.Sam. i love you. can you help me out with this? simplify. (-14x^3)(/x^3-5x^4)
OpenStudy (anonymous):
@Luigi0210 aw, you helped too. :)
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OpenStudy (luigi0210):
:(
sam (.sam.):
Same thing, factor x^3 from denominator then cancel it
OpenStudy (anonymous):
@.Sam. -14x/1x-5?
OpenStudy (phi):
that looks like one of the choices, i.e. a pure guess.
sam (.sam.):
should be
-14/1-5x
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OpenStudy (anonymous):
@.Sam. ohh
sam (.sam.):
\[\frac{-14x^3}{x^3-5x^4}=\frac{-14\cancel{x^3}}{\cancel{x^3}(1-5x)}=\frac{-14}{1-5x}\]
OpenStudy (anonymous):
@.Sam. ohhh, I see!
OpenStudy (anonymous):
@.Sam. so for x+7/x^2+4x-2, would it be 1/x-7??
sam (.sam.):
look at the denominator, looks like it can't be factored
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OpenStudy (anonymous):
@.Sam. you're right.. ach, i feel so stupid! :/
OpenStudy (anonymous):
@.Sam. wait, is it 1/x-3?
sam (.sam.):
no, if you cant factor, the answer will just be x+7/x^2+4x-2
OpenStudy (anonymous):
@.Sam. but, that's not an option
sam (.sam.):
maybe you wrote the question wrongly
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OpenStudy (anonymous):
@.Sam. no, that's the question
sam (.sam.):
\[\Huge \frac{x+7}{x^2+4x-2}\]