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Adi3

  • one year ago

Will Medal Please help solve for x: x-1/1+2 = 2/x

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  1. Adi3
    • one year ago
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    @IrishBoy123

  2. IrishBoy123
    • one year ago
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    can you draw it, do not understand what you are solving...

  3. Adi3
    • one year ago
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    solve for x: \[\frac{ x-1 }{ x+2} = \frac{ 2 }{ x }\]

  4. IrishBoy123
    • one year ago
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    multiply both sides by \((x+2)x\) [or cross multiply, as it is called, though it is the same thing...]

  5. Adi3
    • one year ago
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    i am going with cross, x(x-1) = 2(x+2)

  6. IrishBoy123
    • one year ago
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    great

  7. Adi3
    • one year ago
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    ok, then

  8. IrishBoy123
    • one year ago
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    multiply out and combine terms to get a quadratic

  9. Adi3
    • one year ago
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    x^2 - 1x = 2x+4

  10. Adi3
    • one year ago
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    then?

  11. IrishBoy123
    • one year ago
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    then \(x^2 - 3x - 4 = 0\) and now factor

  12. Adi3
    • one year ago
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    = (x+1) (x-4)

  13. anonymous
    • one year ago
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    4 and -1

  14. IrishBoy123
    • one year ago
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    @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

  15. Adi3
    • one year ago
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    how would you do that??

  16. anonymous
    • one year ago
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    @IrishBoy123 Labhraíonn tú Gaeilge? Ansin, is féidir leat cabhrú liom ... Ní féidir leat?

  17. Adi3
    • one year ago
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    @IrishBoy123

  18. Adi3
    • one year ago
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    @IrishBoy123

  19. Adi3
    • one year ago
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    oh is it foil??

  20. IrishBoy123
    • one year ago
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    check these \(\frac{ -1-1 }{ -1+2} = \frac{ 2 }{ -1 }\) ??? \(\frac{ 4-1 }{ 4+2} = \frac{ 2 }{ 4 }\) ???

  21. anonymous
    • one year ago
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    @IrishBoy123 Dhíth orm desperately do chabhair . Níorbh fhéidir leat le do thoil cabhrú liom nuair a fhaigheann tú an deis ? Tá sé éadóchasach .

  22. Adi3
    • one year ago
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    wht did you just do??

  23. IrishBoy123
    • one year ago
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    plugged your answers into the original equation you were given...

  24. IrishBoy123
    • one year ago
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    ie plug 4 and -1 into \(\frac{ x-1 }{ x+2} = \frac{ 2 }{ x }\) to check them....

  25. Adi3
    • one year ago
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    how would you plug two equations in x?

  26. IrishBoy123
    • one year ago
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    i will be around and about later, feel free to tag.

  27. IrishBoy123
    • one year ago
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    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 \(\frac{3}{6} = \frac{2}{4} \checkmark\)

  28. Adi3
    • one year ago
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    ok, medal me pls.

  29. anonymous
    • one year ago
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    @IrishBoy123 Hilfe bitte?

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