Adi3
  • Adi3
Will Medal Please help solve for x: x-1/1+2 = 2/x
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Adi3
  • Adi3
@IrishBoy123
IrishBoy123
  • IrishBoy123
can you draw it, do not understand what you are solving...
Adi3
  • Adi3
solve for x: \[\frac{ x-1 }{ x+2} = \frac{ 2 }{ x }\]

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More answers

IrishBoy123
  • IrishBoy123
multiply both sides by \((x+2)x\) [or cross multiply, as it is called, though it is the same thing...]
Adi3
  • Adi3
i am going with cross, x(x-1) = 2(x+2)
IrishBoy123
  • IrishBoy123
great
Adi3
  • Adi3
ok, then
IrishBoy123
  • IrishBoy123
multiply out and combine terms to get a quadratic
Adi3
  • Adi3
x^2 - 1x = 2x+4
Adi3
  • Adi3
then?
IrishBoy123
  • IrishBoy123
then \(x^2 - 3x - 4 = 0\) and now factor
Adi3
  • Adi3
= (x+1) (x-4)
anonymous
  • anonymous
4 and -1
IrishBoy123
  • IrishBoy123
@Adi3 good stuff tip: in an exam, i would actually take those numbers and put them back into the original equation just to be triply sure :p
Adi3
  • Adi3
how would you do that??
anonymous
  • anonymous
@IrishBoy123 Labhraíonn tú Gaeilge? Ansin, is féidir leat cabhrú liom ... Ní féidir leat?
Adi3
  • Adi3
@IrishBoy123
Adi3
  • Adi3
@IrishBoy123
Adi3
  • Adi3
oh is it foil??
IrishBoy123
  • IrishBoy123
check these \(\frac{ -1-1 }{ -1+2} = \frac{ 2 }{ -1 }\) ??? \(\frac{ 4-1 }{ 4+2} = \frac{ 2 }{ 4 }\) ???
anonymous
  • anonymous
@IrishBoy123 Dhíth orm desperately do chabhair . Níorbh fhéidir leat le do thoil cabhrú liom nuair a fhaigheann tú an deis ? Tá sé éadóchasach .
Adi3
  • Adi3
wht did you just do??
IrishBoy123
  • IrishBoy123
plugged your answers into the original equation you were given...
IrishBoy123
  • IrishBoy123
ie plug 4 and -1 into \(\frac{ x-1 }{ x+2} = \frac{ 2 }{ x }\) to check them....
Adi3
  • Adi3
how would you plug two equations in x?
IrishBoy123
  • IrishBoy123
i will be around and about later, feel free to tag.
IrishBoy123
  • IrishBoy123
put them in separately so for x = 4 \(\frac{ x-1 }{ x+2} = \frac{ 2 }{ x } \implies \frac{ 4-1 }{ 4+2} = \frac{ 2 }{ 4 }\) that is \(\frac{3}{6} = \frac{2}{4} \checkmark\)
Adi3
  • Adi3
ok, medal me pls.
anonymous
  • anonymous
@IrishBoy123 Hilfe bitte?

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