## anonymous 3 years ago i need help:

1. anonymous

with...

2. anonymous

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

3. anonymous

solve for x

4. anonymous

5. anonymous

kk

6. anonymous

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

7. anonymous

lol

8. anonymous

getting x by itself is getting the actual values.

9. anonymous

no i meant like a numerical value

10. anonymous

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

11. anonymous

ok

12. anonymous

i have know idea what to do

13. anonymous

did you square both sides?

14. anonymous

ya

15. anonymous

what did you get

16. anonymous

umm idk

17. anonymous

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

18. anonymous

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

19. anonymous

i need to solve for x

20. anonymous

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

21. anonymous

how do you get ^2

22. anonymous

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. anonymous

oh ^2 means sqaure

24. anonymous

oo

25. anonymous

so you get how to square both sides then?

26. anonymous

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

27. anonymous

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

28. anonymous

ya

29. anonymous

that would be 5 ya

30. anonymous

yeah this question is pretty much the same thing

31. anonymous

oo

32. anonymous

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. anonymous

so you square the 3d

34. anonymous

yup and also the sqrt 4x-y

35. anonymous

so would it be 9d

36. anonymous

9d^2 but yeah

37. anonymous

kk then what do i do

38. anonymous

did you also square the other side?

39. anonymous

so would it be 16x-y^2

40. anonymous

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. anonymous

so it stays the same

42. anonymous

yeah

43. anonymous

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

44. anonymous

would the square roots still be there

45. anonymous

no

46. anonymous

k

47. anonymous

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

48. anonymous

ok well you should also probably ask your teacher this too cause in math it's really important to know why things happen

49. anonymous

yeah exactly

50. anonymous

kk i dont have a teacher

51. anonymous

oh...how does that work?

52. anonymous

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

53. anonymous

ohh ok

54. anonymous

ya

55. anonymous

how do i get x by it's self

56. anonymous

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

57. anonymous

14 in 9

58. anonymous

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. anonymous

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

60. anonymous

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

61. anonymous

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

62. anonymous

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

63. anonymous

oo k

64. anonymous

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

65. anonymous

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

66. anonymous

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

67. anonymous

lol thank you hes only 15

68. anonymous

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

69. anonymous

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. anonymous

ohh the kids do what they have to?

71. anonymous

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

72. anonymous

oh. well anyways good luck. time heals

73. anonymous

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

74. anonymous

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. anonymous

you divide 4 on both sides

76. anonymous

because what happens on one side you do to the other

77. anonymous

yeah! exactly! :D good job

78. anonymous

thank you so it would be 2.25 d^2y

79. anonymous

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

80. anonymous

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