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anonymous

  • 5 years ago

how can i solve a quadratic equation like this 6x^2-5+x=0

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  1. anonymous
    • 5 years ago
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    rewrite it in the normal form and plug into the quadratic equation: \[ax^2 + bx + c = 0 \implies x = \frac{-(b) \pm \sqrt{(b)^2-4(a)(c)}}{2(a)}\]

  2. anonymous
    • 5 years ago
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    thank you i did that part but where i am getting cofused at is that addition/ subtraction sign i dont kno what to do with it sorry i didnt say that earlier

  3. anonymous
    • 5 years ago
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    Oh, well unless the part under the square root is 0 you will get 2 different possible solutions. \[x = \frac{-(b) + \sqrt{(b)^2-4(a)(c)}}{2(a)}\] and \[x = \frac{-(b) - \sqrt{(b)^2-4(a)(c)}}{2(a)}\] The \(\pm\) thing just makes it easier to write.

  4. anonymous
    • 5 years ago
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    oh ok thank you i'ma try it now :D

  5. anonymous
    • 5 years ago
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    HOW WOUD I GET THAT SQUARE ROOT SYMBOL ON THE CALCULATOR

  6. anonymous
    • 5 years ago
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    It should have it. If not you can raise it to the .5 power.

  7. anonymous
    • 5 years ago
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    LIKE THIS (1^2-4(6)(-5)^5

  8. anonymous
    • 5 years ago
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    it gave me some crazy number how would you do it i guess i was wrong

  9. anonymous
    • 5 years ago
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    i got 2.59374246E10

  10. anonymous
    • 5 years ago
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    Not quite. What do you have before you plug it in?

  11. anonymous
    • 5 years ago
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    i did 1^2-4(6)(-5) and i recieved 121 but then i raised that to the 5th power and i got that wierd number

  12. anonymous
    • 5 years ago
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    but then instead of that i subtracted -5 then i divided by 12 and i got 10.5

  13. anonymous
    • 5 years ago
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    ?

  14. anonymous
    • 5 years ago
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    why did you raise to the 5th. I said .5 or 0.5 or 1/2

  15. anonymous
    • 5 years ago
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    that's probably the issue.

  16. anonymous
    • 5 years ago
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    i still dnt get it i'm sorry for wasting your time!

  17. anonymous
    • 5 years ago
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    Your calculator doesn't have a square root button?

  18. anonymous
    • 5 years ago
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    it does but it is a blue sign above the X^2 button i cnt seem to get the sign but i always get the X^2

  19. anonymous
    • 5 years ago
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    ?

  20. anonymous
    • 5 years ago
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    What kind of calculator do you have

  21. anonymous
    • 5 years ago
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    a TI-84 PLUS SILVER ADDITION

  22. anonymous
    • 5 years ago
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    Do you see the blue func button? Press that first, then press the x^2 button.

  23. anonymous
    • 5 years ago
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    err should say 2nd on it.

  24. anonymous
    • 5 years ago
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    I GOT IT! yah thanx yu

  25. anonymous
    • 5 years ago
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    i got a -48

  26. anonymous
    • 5 years ago
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    The square root of 121 is 11

  27. anonymous
    • 5 years ago
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    So you should have \[x = \frac{-1 \pm 11}{2(6)}\]

  28. anonymous
    • 5 years ago
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    i feel so dum sorry!

  29. anonymous
    • 5 years ago
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    sorry

  30. anonymous
    • 5 years ago
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    hrm?

  31. anonymous
    • 5 years ago
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    i got 32and -34 do i put down both of my answers

  32. anonymous
    • 5 years ago
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    How do you get that?

  33. anonymous
    • 5 years ago
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    -1 + 11 = 10 -1 - 11 = -12 So you should have 10/12 and -12/12 = -1

  34. anonymous
    • 5 years ago
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    omg! im sorry but im dne i cnt do this!

  35. anonymous
    • 5 years ago
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    I don't understand what's confusing you.

  36. anonymous
    • 5 years ago
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    If you can explain I can try to help.

  37. anonymous
    • 5 years ago
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    i just dont know how to do this im basically confused about evrything i dnt know what else to do

  38. anonymous
    • 5 years ago
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    Well hang on.

  39. anonymous
    • 5 years ago
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    Can you simplify the expression \[\frac{4+3}{8}\]

  40. anonymous
    • 5 years ago
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    7/8

  41. anonymous
    • 5 years ago
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    1.142857143?

  42. anonymous
    • 5 years ago
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    no im sorry 7/8

  43. anonymous
    • 5 years ago
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    u k i have no idea wat ur sayin im in 5th grade '

  44. anonymous
    • 5 years ago
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    ?

  45. anonymous
    • 5 years ago
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    Yes, 7/8 is correct

  46. anonymous
    • 5 years ago
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    Now try this one: \[\frac{4-3}{2(4)}\]

  47. anonymous
    • 5 years ago
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    polpok ur awesome

  48. anonymous
    • 5 years ago
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    heh, thanks.

  49. anonymous
    • 5 years ago
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    np

  50. anonymous
    • 5 years ago
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    When working with fractions like this, just try to simplify the top and bottom separately.

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