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Katelynmorris

  • 2 years ago

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

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

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

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

  4. Katelynmorris
    • 2 years ago
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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. shamil98
    • 2 years ago
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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

  6. swissgirl
    • 2 years ago
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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

  7. Katelynmorris
    • 2 years ago
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    Well that would be -4 and 1.

  8. shamil98
    • 2 years ago
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    correct.

  9. swissgirl
    • 2 years ago
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    Correct

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

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

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

  13. shamil98
    • 2 years ago
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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.

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

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

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

  17. shamil98
    • 2 years ago
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    You made a mistake I believe.. @swissgirl

  18. swissgirl
    • 2 years ago
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    At which point?

  19. shamil98
    • 2 years ago
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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

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

  21. swissgirl
    • 2 years ago
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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

  22. swissgirl
    • 2 years ago
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    @Katelynmorris which method are you familiar with?

  23. shamil98
    • 2 years ago
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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

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

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

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

  27. LolaTorezz2011
    • 2 years ago
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    listen to sham, he got da plan @_@

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

  29. LolaTorezz2011
    • 2 years ago
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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

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

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

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

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

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

  35. Katelynmorris
    • 2 years ago
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    Ok so x= 4, -1?

  36. shamil98
    • 2 years ago
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    Yes, those are your solutions.

  37. Katelynmorris
    • 2 years ago
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    Thanks.

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

  39. LolaTorezz2011
    • 2 years ago
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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 @_@

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

  41. LolaTorezz2011
    • 2 years ago
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    LAWL XD

  42. LolaTorezz2011
    • 2 years ago
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    OMG THEY ACTUALLY EXCIST o-o

  43. LolaTorezz2011
    • 2 years ago
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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

  44. BulletWithButterflyWings
    • 2 years ago
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    stalking profile now

  45. LolaTorezz2011
    • 2 years ago
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    XD

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