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Shido88 Group Title

Find the Vertex: f(x)= -3x^2-7x+6

  • one year ago
  • one year ago

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  1. Shido88 Group Title
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    @saifoo.khan helpppp lol

    • one year ago
  2. saifoo.khan Group Title
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    Hey. To find vertex there's a shortcut.

    • one year ago
  3. Shido88 Group Title
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    uh huh

    • one year ago
  4. saifoo.khan Group Title
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    to find the x-cordinate, use this formula: -b/2a

    • one year ago
  5. saifoo.khan Group Title
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    -(-7)/2(-3)

    • one year ago
  6. Shido88 Group Title
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    that will give me the vertex ?

    • one year ago
  7. saifoo.khan Group Title
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    Yes. "x-cordinate" of vertex.

    • one year ago
  8. saifoo.khan Group Title
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    Solve it first..

    • one year ago
  9. Shido88 Group Title
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    kk hold on :)

    • one year ago
  10. saifoo.khan Group Title
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    Holding.. :)

    • one year ago
  11. Shido88 Group Title
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    got 7/6

    • one year ago
  12. Shido88 Group Title
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    vertex is (h,k) right? so i believe that is the "h" ?

    • one year ago
  13. saifoo.khan Group Title
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    Perfect. ^

    • one year ago
  14. saifoo.khan Group Title
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    Find k now.

    • one year ago
  15. Shido88 Group Title
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    how to find k lol ?

    • one year ago
  16. saifoo.khan Group Title
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    Lol. Use GOogle. Jk.

    • one year ago
  17. Shido88 Group Title
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    i got it lmao :))

    • one year ago
  18. Shido88 Group Title
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    hold on

    • one year ago
  19. saifoo.khan Group Title
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    Okay. so now use 7/6 to find it. y = -3x^2-7x+6 y = -3(7/6)^2 -7(7/6) + 6 solve.

    • one year ago
  20. Shido88 Group Title
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    got decimal :( hate decimal

    • one year ago
  21. Shido88 Group Title
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    so the vertex would be : (7/6, -6.24) ?

    • one year ago
  22. saifoo.khan Group Title
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    Should be 121/12

    • one year ago
  23. Shido88 Group Title
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    wtf ?

    • one year ago
  24. Shido88 Group Title
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    how? :O

    • one year ago
  25. Shido88 Group Title
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    -156/25

    • one year ago
  26. Shido88 Group Title
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    hey come back here >:o

    • one year ago
  27. saifoo.khan Group Title
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    VERTEX SHOULD BE -7/6. -_-

    • one year ago
  28. saifoo.khan Group Title
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    THE X-CORDINATE.

    • one year ago
  29. Shido88 Group Title
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    CALM DOWN !! CAPS WAR XD

    • one year ago
  30. saifoo.khan Group Title
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    ONE NEGATIVE SIGN RUINS EVERYTHING. >_<

    • one year ago
  31. Shido88 Group Title
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    so -7/6 because its opposite of 7/6 ?

    • one year ago
  32. Shido88 Group Title
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    you suppose to change it everytime ?

    • one year ago
  33. Shido88 Group Title
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    how come my teacher didn't change it -_____-

    • one year ago
  34. saifoo.khan Group Title
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    No. we calculated the x-cordinate wrong in the first place.

    • one year ago
  35. Shido88 Group Title
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    oh....XD

    • one year ago
  36. saifoo.khan Group Title
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    \[-\frac{b}{2a} \to -\frac{(-7)}{2(-3)}\to \frac{7}{-6} \to -\frac 76\]

    • one year ago
  37. Shido88 Group Title
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    ohhhhhhhhh i see now lmao hhahaha :D

    • one year ago
  38. Shido88 Group Title
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    omfg...my whole problem is wrong, thanks saif ! lol : XD

    • one year ago
  39. Shido88 Group Title
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    +99 medals

    • one year ago
  40. saifoo.khan Group Title
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    ;D Thanks.

    • one year ago
  41. Shido88 Group Title
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    hmm instead of 121/10 should i just leave it as 10.08 cuz i have to graph this afterward ?

    • one year ago
  42. Shido88 Group Title
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    great now i gotta calculate x-int and y-int :| let see......

    • one year ago
  43. saifoo.khan Group Title
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    Sure. Same thing. Depends on in what format your teacher wants

    • one year ago
  44. Shido88 Group Title
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    stay there.. lol

    • one year ago
  45. saifoo.khan Group Title
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    Lol. okays.

    • one year ago
  46. Shido88 Group Title
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    stuck lol....find x-intercept?

    • one year ago
  47. Shido88 Group Title
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    i know let y=0

    • one year ago
  48. Shido88 Group Title
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    0=-3x^2-7x+6

    • one year ago
  49. Shido88 Group Title
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    -6=-3x^2-7x <-----stuck here..

    • one year ago
  50. saifoo.khan Group Title
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    Use quadratic formula

    • one year ago
  51. Shido88 Group Title
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    oh yee

    • one year ago
  52. saifoo.khan Group Title
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    https://www.khanacademy.org/math/algebra/quadratics/quadratic_formula/v/quadratic-formula-1

    • one year ago
  53. Shido88 Group Title
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    but the way my teacher did it was to set y=0 and just add and divide stuff on left and right side...which is confusing but i suppose we can use quadratic aswell :)

    • one year ago
  54. saifoo.khan Group Title
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    Your teacher must have used the "completing the square" method. It's hella confusing. It confuses me too. :/

    • one year ago
  55. Shido88 Group Title
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    yeah thats what that was, completing the square lol.... ok i got y= 7+- sqrt(-23)/-6 and what's next ?

    • one year ago
  56. Shido88 Group Title
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    i dont think u can reduce it down or anything right? and u can't even square root a negative

    • one year ago
  57. saifoo.khan Group Title
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    https://www.khanacademy.org/math/algebra/quadratics/quadratic_formula/v/quadratic-formula-1

    • one year ago
  58. saifoo.khan Group Title
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    No. We can't reduce.

    • one year ago
  59. saifoo.khan Group Title
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    u can't even square root a negative Yes you're very right.

    • one year ago
  60. Shido88 Group Title
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    ohh i get it, it's 7+- 23i/-6

    • one year ago
  61. saifoo.khan Group Title
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    Roots are: -14 and 0.

    • one year ago
  62. saifoo.khan Group Title
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    Roots are: -3 and 2/3

    • one year ago
  63. Shido88 Group Title
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    what? @_@

    • one year ago
  64. Shido88 Group Title
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    was that you on the video? https://www.khanacademy.org/math/algebra/quadratics/quadratic_formula/v/quadratic-formula-1

    • one year ago
  65. saifoo.khan Group Title
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    Haha. Ofcourse not.

    • one year ago
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