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Katelynmorris Group Title

solve the quadratic equation. x^2-3x=4

  • 10 months ago
  • 10 months ago

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  1. shamil98 Group Title
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    x^2 - 3x - 4 = 0 factor it.

    • 10 months ago
  2. swissgirl Group Title
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    We first need to set it up in the form \(ax^2+bx+c=0\)

    • 10 months ago
  3. swissgirl Group Title
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    Well ya like @shamil98 has shown we subtract 4 from both sides to achieve this

    • 10 months ago
  4. Katelynmorris Group Title
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    Ok I got that. I have x^2-3x-4=0 but I am not sure where to go from there.

    • 10 months ago
  5. shamil98 Group Title
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    you can use the quadratic formula or just factor it to (x+b)(x-b) form. and then solve for (x+b)=0 and (x-b) = 0 to get your solutions

    • 10 months ago
  6. swissgirl Group Title
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    We need to find 2 numbers that when you add them they equal -3 and when you multiply them they equal -4

    • 10 months ago
  7. Katelynmorris Group Title
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    Well that would be -4 and 1.

    • 10 months ago
  8. shamil98 Group Title
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    correct.

    • 10 months ago
  9. swissgirl Group Title
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    Correct

    • 10 months ago
  10. shamil98 Group Title
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    so, in (x+b)(x-b)=0 form it would be?

    • 10 months ago
  11. swissgirl Group Title
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    So basically then we replace -3x with -4x +1x

    • 10 months ago
  12. swissgirl Group Title
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    So our equation would look as follows \(x^2-4x+1x-4\)

    • 10 months ago
  13. shamil98 Group Title
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    (x-4)(x+1) = 0 after you put it in that form x - 4 = 0 and x + 1 = 0 solve for x to get your solutions.

    • 10 months ago
  14. swissgirl Group Title
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    Then we group the first 2 terms and teh last 2 terms \( (x^2-4x)+(x-4)=0

    • 10 months ago
  15. swissgirl Group Title
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    \( (x^2-4x)+(x-4)=0\)

    • 10 months ago
  16. swissgirl Group Title
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    Then we factor out from each bracket x(x-4)+1(x-4)=0

    • 10 months ago
  17. shamil98 Group Title
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    You made a mistake I believe.. @swissgirl

    • 10 months ago
  18. swissgirl Group Title
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    At which point?

    • 10 months ago
  19. shamil98 Group Title
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    Well, she is asking how to find the solution, I have no idea what you are showing.. the original equation is x^2 - 3x - 4. factored out (x-4)(x+1)= 0 x = -1 x =4

    • 10 months ago
  20. shamil98 Group Title
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    x^2 - 4x + x -4 can just be simplified to x^2 -3x - 4 .....

    • 10 months ago
  21. swissgirl Group Title
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    Yes but I am just demonstrating how you factored it out This is the typical way it is taught in school and when it becomes more challenging then it is imperative that you write it out in this fashion

    • 10 months ago
  22. swissgirl Group Title
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    @Katelynmorris which method are you familiar with?

    • 10 months ago
  23. shamil98 Group Title
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    It looks more complicated with your method x^2 -3x -4 you know that the values are 1 and - 4. just put that like this (x-4)(x+1) = 0

    • 10 months ago
  24. Katelynmorris Group Title
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    I am lost after the x^2-4x+1x-4=0..Solving by factoring

    • 10 months ago
  25. swissgirl Group Title
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    But @shamil98 it works this time but what happens if the equation was \(3x^2-3x-4=0\) ?

    • 10 months ago
  26. Katelynmorris Group Title
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    Ok so after the (x-4)(x+1)=0 that gives me x how?

    • 10 months ago
  27. LolaTorezz2011 Group Title
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    listen to sham, he got da plan @_@

    • 10 months ago
  28. shamil98 Group Title
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    (x-4)(x+1)=0 you put x-4=0 and x+1=0 to get your solutions .

    • 10 months ago
  29. LolaTorezz2011 Group Title
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    @Katelynmorris just look at daht smart score of his @_@ YO SWISS, DONT BE CHEESY <3 I loe u, but let L do his Justice <3

    • 10 months ago
  30. shamil98 Group Title
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    3x2−3x−4=0 swiss, i would use the quadratic formula. instead of trying to factor it.

    • 10 months ago
  31. swissgirl Group Title
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    You can use whtvr it makes no diff as long as you get your answer

    • 10 months ago
  32. shamil98 Group Title
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    Your method is much more complicated than it needs to be, just make it simple..

    • 10 months ago
  33. swissgirl Group Title
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    The only reason why I was showing him that method since that is the method taught in schools

    • 10 months ago
  34. swissgirl Group Title
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    Plus your method wont work for complicated equations trust me kid

    • 10 months ago
  35. Katelynmorris Group Title
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    Ok so x= 4, -1?

    • 10 months ago
  36. shamil98 Group Title
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    Yes, those are your solutions.

    • 10 months ago
  37. Katelynmorris Group Title
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    Thanks.

    • 10 months ago
  38. LolaTorezz2011 Group Title
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    as a drunk person on peaches, let me tell u somethin swiss cheese, sham aint no kid, he be Justice @_@

    • 10 months ago
  39. LolaTorezz2011 Group Title
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    don't make me get my peaches loe <3 @Katelynmorris listen to sham, hes been doin dis for years @_@ just look at daht bronze 76 he got @_@

    • 10 months ago
  40. BulletWithButterflyWings Group Title
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    every time you type @_@ you tag whoever that is lol

    • 10 months ago
  41. LolaTorezz2011 Group Title
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    LAWL XD

    • 10 months ago
  42. LolaTorezz2011 Group Title
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    OMG THEY ACTUALLY EXCIST o-o

    • 10 months ago
  43. LolaTorezz2011 Group Title
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    I have been using that face for so many times like this.........they will witness the spam of there lives when they come back XD

    • 10 months ago
  44. BulletWithButterflyWings Group Title
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    stalking profile now

    • 10 months ago
  45. LolaTorezz2011 Group Title
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    XD

    • 10 months ago
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