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Katelynmorris

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

  • 5 months ago
  • 5 months ago

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

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

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

    • 5 months ago
  4. Katelynmorris
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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.

    • 5 months ago
  5. shamil98
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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

    • 5 months ago
  6. swissgirl
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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

    • 5 months ago
  7. Katelynmorris
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    Well that would be -4 and 1.

    • 5 months ago
  8. shamil98
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    correct.

    • 5 months ago
  9. swissgirl
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    Correct

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

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

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

    • 5 months ago
  13. shamil98
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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.

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

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

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

    • 5 months ago
  17. shamil98
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    You made a mistake I believe.. @swissgirl

    • 5 months ago
  18. swissgirl
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    At which point?

    • 5 months ago
  19. shamil98
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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

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

    • 5 months ago
  21. swissgirl
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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

    • 5 months ago
  22. swissgirl
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    @Katelynmorris which method are you familiar with?

    • 5 months ago
  23. shamil98
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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

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

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

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

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

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

    • 5 months ago
  29. LolaTorezz2011
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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

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

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

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

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

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

    • 5 months ago
  35. Katelynmorris
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    Ok so x= 4, -1?

    • 5 months ago
  36. shamil98
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    Yes, those are your solutions.

    • 5 months ago
  37. Katelynmorris
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    Thanks.

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

    • 5 months ago
  39. LolaTorezz2011
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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 @_@

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

    • 5 months ago
  41. LolaTorezz2011
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    LAWL XD

    • 5 months ago
  42. LolaTorezz2011
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    OMG THEY ACTUALLY EXCIST o-o

    • 5 months ago
  43. LolaTorezz2011
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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

    • 5 months ago
  44. BulletWithButterflyWings
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    stalking profile now

    • 5 months ago
  45. LolaTorezz2011
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    XD

    • 5 months ago
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