mercedies Group Title i need help: one year ago one year ago

1. joshi Group Title

with...

2. mercedies Group Title

$\sqrt{4x-y}=3d$

3. mercedies Group Title

solve for x

4. scarydoor Group Title

5. mercedies Group Title

kk

6. joshi Group Title

oh do you just need x by itself? i thought you wanted like actual values. ok phew

7. mercedies Group Title

lol

8. scarydoor Group Title

getting x by itself is getting the actual values.

9. joshi Group Title

no i meant like a numerical value

10. scarydoor Group Title

it would be a numerical value. Determined by unknown d and variable y.

11. mercedies Group Title

ok

12. mercedies Group Title

i have know idea what to do

13. joshi Group Title

did you square both sides?

14. mercedies Group Title

ya

15. joshi Group Title

what did you get

16. mercedies Group Title

umm idk

17. joshi Group Title

what do you mean? well i got 4x-y=9d^2

18. mercedies Group Title

$\sqrt{4x-y}=3d$ummm

19. mercedies Group Title

i need to solve for x

20. joshi Group Title

well squaring both sides would get you (squareroot 4x-y) ^2 = (3d)^2

21. mercedies Group Title

how do you get ^2

22. joshi Group Title

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 Group Title

oh ^2 means sqaure

24. mercedies Group Title

oo

25. joshi Group Title

so you get how to square both sides then?

26. mercedies Group Title

idk this is my first time doing this or a problem like this

27. joshi Group Title

oh ok well have you done questions like this: x^2 = 25

28. mercedies Group Title

ya

29. mercedies Group Title

that would be 5 ya

30. joshi Group Title

yeah this question is pretty much the same thing

31. mercedies Group Title

oo

32. joshi Group Title

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 Group Title

so you square the 3d

34. joshi Group Title

yup and also the sqrt 4x-y

35. mercedies Group Title

so would it be 9d

36. joshi Group Title

9d^2 but yeah

37. mercedies Group Title

kk then what do i do

38. joshi Group Title

did you also square the other side?

39. mercedies Group Title

so would it be 16x-y^2

40. joshi Group Title

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 Group Title

so it stays the same

42. joshi Group Title

yeah

43. joshi Group Title

can you solve it now? you just have to get x by itself

44. mercedies Group Title

would the square roots still be there

45. joshi Group Title

no

46. mercedies Group Title

k

47. mercedies Group Title

so it would look like 4x-y=9d

48. joshi Group Title

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 Group Title

yeah exactly

50. mercedies Group Title

kk i dont have a teacher

51. joshi Group Title

oh...how does that work?

52. mercedies Group Title

well my mom is my teacher but my mom is in the hospital

53. joshi Group Title

ohh ok

54. mercedies Group Title

ya

55. mercedies Group Title

how do i get x by it's self

56. joshi Group Title

sorry if you dont mind me asking, what grade are you in? like technically, like your age

57. mercedies Group Title

14 in 9

58. joshi Group Title

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 Group Title

sorry again, (none of my business i know) but why don't you go to school?

60. mercedies Group Title

so what i got was 4x=9dy drama and lot of fighting

61. joshi Group Title

that's right except that it's d^2 not just d

62. joshi Group Title

oh, well i'm sorry. hope it works out, whatever it is

63. mercedies Group Title

oo k

64. mercedies Group Title

thank you well we are having hard times my bf just got put in jail for a year

65. joshi Group Title

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

66. joshi Group Title

It's good that you're doing math and stuff though

67. mercedies Group Title

lol thank you hes only 15

68. joshi Group Title

i thought you couldn't go to jail unless you're an adult? well i suppose different countries

69. mercedies Group Title

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 Group Title

ohh the kids do what they have to?

71. mercedies Group Title

ya well know that i look back at what happened it is his own problem

72. joshi Group Title

oh. well anyways good luck. time heals

73. mercedies Group Title

ya kk so know what do i do with 4x=9d^2y

74. joshi Group Title

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 Group Title

you divide 4 on both sides

76. mercedies Group Title

because what happens on one side you do to the other

77. joshi Group Title

yeah! exactly! :D good job

78. mercedies Group Title

thank you so it would be 2.25 d^2y

79. joshi Group Title

wait what? so i had 4x=9d^2 + y and so x= (9d^2 + y)/4

80. mercedies Group Title

ya and that is what i did then i divided 9/4=2.25