Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

Katelynmorris

  • one year ago

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

  • This Question is Closed
  1. shamil98
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 5

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

  2. swissgirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

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

  3. swissgirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Well ya like @shamil98 has shown we subtract 4 from both sides to achieve this

  4. Katelynmorris
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Ok I got that. I have x^2-3x-4=0 but I am not sure where to go from there.

  5. shamil98
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 5

    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
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    We need to find 2 numbers that when you add them they equal -3 and when you multiply them they equal -4

  7. Katelynmorris
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Well that would be -4 and 1.

  8. shamil98
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 5

    correct.

  9. swissgirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Correct

  10. shamil98
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 5

    so, in (x+b)(x-b)=0 form it would be?

  11. swissgirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    So basically then we replace -3x with -4x +1x

  12. swissgirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    So our equation would look as follows \(x^2-4x+1x-4\)

  13. shamil98
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 5

    (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
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Then we group the first 2 terms and teh last 2 terms \( (x^2-4x)+(x-4)=0

  15. swissgirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \( (x^2-4x)+(x-4)=0\)

  16. swissgirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Then we factor out from each bracket x(x-4)+1(x-4)=0

  17. shamil98
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 5

    You made a mistake I believe.. @swissgirl

  18. swissgirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    At which point?

  19. shamil98
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 5

    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
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 5

    x^2 - 4x + x -4 can just be simplified to x^2 -3x - 4 .....

  21. swissgirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    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
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @Katelynmorris which method are you familiar with?

  23. shamil98
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 5

    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
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I am lost after the x^2-4x+1x-4=0..Solving by factoring

  25. swissgirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

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

  26. Katelynmorris
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Ok so after the (x-4)(x+1)=0 that gives me x how?

  27. LolaTorezz2011
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    listen to sham, he got da plan @_@

  28. shamil98
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 5

    (x-4)(x+1)=0 you put x-4=0 and x+1=0 to get your solutions .

  29. LolaTorezz2011
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    @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
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 5

    3x2−3x−4=0 swiss, i would use the quadratic formula. instead of trying to factor it.

  31. swissgirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    You can use whtvr it makes no diff as long as you get your answer

  32. shamil98
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 5

    Your method is much more complicated than it needs to be, just make it simple..

  33. swissgirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    The only reason why I was showing him that method since that is the method taught in schools

  34. swissgirl
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Plus your method wont work for complicated equations trust me kid

  35. Katelynmorris
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Ok so x= 4, -1?

  36. shamil98
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 5

    Yes, those are your solutions.

  37. Katelynmorris
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Thanks.

  38. LolaTorezz2011
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    as a drunk person on peaches, let me tell u somethin swiss cheese, sham aint no kid, he be Justice @_@

  39. LolaTorezz2011
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    every time you type @_@ you tag whoever that is lol

  41. LolaTorezz2011
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    LAWL XD

  42. LolaTorezz2011
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    OMG THEY ACTUALLY EXCIST o-o

  43. LolaTorezz2011
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    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
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    stalking profile now

  45. LolaTorezz2011
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 1

    XD

  46. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.