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Katelynmorris Group Title

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

  • one year ago
  • one year ago

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

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

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

    • one year 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.

    • one year 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

    • one year 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

    • one year ago
  7. Katelynmorris Group Title
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    Well that would be -4 and 1.

    • one year ago
  8. shamil98 Group Title
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    correct.

    • one year ago
  9. swissgirl Group Title
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    Correct

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

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

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

    • one year 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.

    • one year 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

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

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

    • one year ago
  17. shamil98 Group Title
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    You made a mistake I believe.. @swissgirl

    • one year ago
  18. swissgirl Group Title
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    At which point?

    • one year 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

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

    • one year 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

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

    • one year 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

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

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

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

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

    • one year 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 .

    • one year 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

    • one year 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.

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

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

    • one year 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

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

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

    • one year ago
  36. shamil98 Group Title
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    Yes, those are your solutions.

    • one year ago
  37. Katelynmorris Group Title
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    Thanks.

    • one year 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 @_@

    • one year 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 @_@

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

    • one year ago
  41. LolaTorezz2011 Group Title
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    LAWL XD

    • one year ago
  42. LolaTorezz2011 Group Title
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    OMG THEY ACTUALLY EXCIST o-o

    • one year 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

    • one year ago
  44. BulletWithButterflyWings Group Title
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    stalking profile now

    • one year ago
  45. LolaTorezz2011 Group Title
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    XD

    • one year ago
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