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mercedies

  • 2 years ago

i need help:

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  1. joshi
    • 2 years ago
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    with...

  2. mercedies
    • 2 years ago
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    \[\sqrt{4x-y}=3d\]

  3. mercedies
    • 2 years ago
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    solve for x

  4. scarydoor
    • 2 years ago
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    You can square both sides, to start with.

  5. mercedies
    • 2 years ago
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    kk

  6. joshi
    • 2 years ago
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    oh do you just need x by itself? i thought you wanted like actual values. ok phew

  7. mercedies
    • 2 years ago
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    lol

  8. scarydoor
    • 2 years ago
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    getting x by itself is getting the actual values.

  9. joshi
    • 2 years ago
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    no i meant like a numerical value

  10. scarydoor
    • 2 years ago
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    it would be a numerical value. Determined by unknown d and variable y.

  11. mercedies
    • 2 years ago
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    ok

  12. mercedies
    • 2 years ago
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    i have know idea what to do

  13. joshi
    • 2 years ago
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    did you square both sides?

  14. mercedies
    • 2 years ago
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    ya

  15. joshi
    • 2 years ago
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    what did you get

  16. mercedies
    • 2 years ago
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    umm idk

  17. joshi
    • 2 years ago
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    what do you mean? well i got 4x-y=9d^2

  18. mercedies
    • 2 years ago
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    \[\sqrt{4x-y}=3d\]ummm

  19. mercedies
    • 2 years ago
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    i need to solve for x

  20. joshi
    • 2 years ago
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    well squaring both sides would get you (squareroot 4x-y) ^2 = (3d)^2

  21. mercedies
    • 2 years ago
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    how do you get ^2

  22. joshi
    • 2 years ago
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    and so now you're squaring a square root. it's like (squareroot of 4)^2 square root of 4 is 2 right? so it would be 2^2 which is 4 again. so basically if you're squaring a square root, you're not really doing anything so the square root and square cancel each other out if that makes sense

  23. joshi
    • 2 years ago
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    oh ^2 means sqaure

  24. mercedies
    • 2 years ago
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    oo

  25. joshi
    • 2 years ago
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    so you get how to square both sides then?

  26. mercedies
    • 2 years ago
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    idk this is my first time doing this or a problem like this

  27. joshi
    • 2 years ago
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    oh ok well have you done questions like this: x^2 = 25

  28. mercedies
    • 2 years ago
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    ya

  29. mercedies
    • 2 years ago
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    that would be 5 ya

  30. joshi
    • 2 years ago
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    yeah this question is pretty much the same thing

  31. mercedies
    • 2 years ago
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    oo

  32. joshi
    • 2 years ago
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    so in the x^2=25 you basically square rooted both sides. so square root of x^2 = square root of 25 x=5 but it in this question you have to square both sides, give it another try

  33. mercedies
    • 2 years ago
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    so you square the 3d

  34. joshi
    • 2 years ago
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    yup and also the sqrt 4x-y

  35. mercedies
    • 2 years ago
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    so would it be 9d

  36. joshi
    • 2 years ago
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    9d^2 but yeah

  37. mercedies
    • 2 years ago
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    kk then what do i do

  38. joshi
    • 2 years ago
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    did you also square the other side?

  39. mercedies
    • 2 years ago
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    so would it be 16x-y^2

  40. joshi
    • 2 years ago
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    no because remember its squareroot of 4x-y already. so squaring it gets you squareroot of 4x-y times squareroot of 4x-y which is just 4x-y

  41. mercedies
    • 2 years ago
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    so it stays the same

  42. joshi
    • 2 years ago
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    yeah

  43. joshi
    • 2 years ago
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    can you solve it now? you just have to get x by itself

  44. mercedies
    • 2 years ago
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    would the square roots still be there

  45. joshi
    • 2 years ago
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    no

  46. mercedies
    • 2 years ago
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    k

  47. mercedies
    • 2 years ago
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    so it would look like 4x-y=9d

  48. joshi
    • 2 years ago
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    ok well you should also probably ask your teacher this too cause in math it's really important to know why things happen

  49. joshi
    • 2 years ago
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    yeah exactly

  50. mercedies
    • 2 years ago
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    kk i dont have a teacher

  51. joshi
    • 2 years ago
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    oh...how does that work?

  52. mercedies
    • 2 years ago
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    well my mom is my teacher but my mom is in the hospital

  53. joshi
    • 2 years ago
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    ohh ok

  54. mercedies
    • 2 years ago
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    ya

  55. mercedies
    • 2 years ago
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    how do i get x by it's self

  56. joshi
    • 2 years ago
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    sorry if you dont mind me asking, what grade are you in? like technically, like your age

  57. mercedies
    • 2 years ago
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    14 in 9

  58. joshi
    • 2 years ago
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    so in an equation whatever you do to one side, you have to do to another. so you could add y to both sides which would get you 4x by itself

  59. joshi
    • 2 years ago
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    sorry again, (none of my business i know) but why don't you go to school?

  60. mercedies
    • 2 years ago
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    so what i got was 4x=9dy drama and lot of fighting

  61. joshi
    • 2 years ago
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    that's right except that it's d^2 not just d

  62. joshi
    • 2 years ago
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    oh, well i'm sorry. hope it works out, whatever it is

  63. mercedies
    • 2 years ago
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    oo k

  64. mercedies
    • 2 years ago
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    thank you well we are having hard times my bf just got put in jail for a year

  65. joshi
    • 2 years ago
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    aww :/ Imagine all the people, living life in peace... *swaying to the awesome music* sorry, only thing i could think of

  66. joshi
    • 2 years ago
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    It's good that you're doing math and stuff though

  67. mercedies
    • 2 years ago
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    lol thank you hes only 15

  68. joshi
    • 2 years ago
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    i thought you couldn't go to jail unless you're an adult? well i suppose different countries

  69. mercedies
    • 2 years ago
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    ya well i live in hawaii so there is only two jails and one prison and a whole lot of bad kids they do what they have to

  70. joshi
    • 2 years ago
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    ohh the kids do what they have to?

  71. mercedies
    • 2 years ago
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    ya well know that i look back at what happened it is his own problem

  72. joshi
    • 2 years ago
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    oh. well anyways good luck. time heals

  73. mercedies
    • 2 years ago
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    ya kk so know what do i do with 4x=9d^2y

  74. joshi
    • 2 years ago
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    oh i thought you'd solved it. well think about, this time entire time you've been doing things to both sides. how would you get x by itself this time?

  75. mercedies
    • 2 years ago
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    you divide 4 on both sides

  76. mercedies
    • 2 years ago
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    because what happens on one side you do to the other

  77. joshi
    • 2 years ago
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    yeah! exactly! :D good job

  78. mercedies
    • 2 years ago
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    thank you so it would be 2.25 d^2y

  79. joshi
    • 2 years ago
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    wait what? so i had 4x=9d^2 + y and so x= (9d^2 + y)/4

  80. mercedies
    • 2 years ago
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    ya and that is what i did then i divided 9/4=2.25

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