anonymous
  • anonymous
i need help:
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
with...
anonymous
  • anonymous
\[\sqrt{4x-y}=3d\]
anonymous
  • anonymous
solve for x

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anonymous
  • anonymous
You can square both sides, to start with.
anonymous
  • anonymous
kk
anonymous
  • anonymous
oh do you just need x by itself? i thought you wanted like actual values. ok phew
anonymous
  • anonymous
lol
anonymous
  • anonymous
getting x by itself is getting the actual values.
anonymous
  • anonymous
no i meant like a numerical value
anonymous
  • anonymous
it would be a numerical value. Determined by unknown d and variable y.
anonymous
  • anonymous
ok
anonymous
  • anonymous
i have know idea what to do
anonymous
  • anonymous
did you square both sides?
anonymous
  • anonymous
ya
anonymous
  • anonymous
what did you get
anonymous
  • anonymous
umm idk
anonymous
  • anonymous
what do you mean? well i got 4x-y=9d^2
anonymous
  • anonymous
\[\sqrt{4x-y}=3d\]ummm
anonymous
  • anonymous
i need to solve for x
anonymous
  • anonymous
well squaring both sides would get you (squareroot 4x-y) ^2 = (3d)^2
anonymous
  • anonymous
how do you get ^2
anonymous
  • 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
anonymous
  • anonymous
oh ^2 means sqaure
anonymous
  • anonymous
oo
anonymous
  • anonymous
so you get how to square both sides then?
anonymous
  • anonymous
idk this is my first time doing this or a problem like this
anonymous
  • anonymous
oh ok well have you done questions like this: x^2 = 25
anonymous
  • anonymous
ya
anonymous
  • anonymous
that would be 5 ya
anonymous
  • anonymous
yeah this question is pretty much the same thing
anonymous
  • anonymous
oo
anonymous
  • 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
anonymous
  • anonymous
so you square the 3d
anonymous
  • anonymous
yup and also the sqrt 4x-y
anonymous
  • anonymous
so would it be 9d
anonymous
  • anonymous
9d^2 but yeah
anonymous
  • anonymous
kk then what do i do
anonymous
  • anonymous
did you also square the other side?
anonymous
  • anonymous
so would it be 16x-y^2
anonymous
  • 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
anonymous
  • anonymous
so it stays the same
anonymous
  • anonymous
yeah
anonymous
  • anonymous
can you solve it now? you just have to get x by itself
anonymous
  • anonymous
would the square roots still be there
anonymous
  • anonymous
no
anonymous
  • anonymous
k
anonymous
  • anonymous
so it would look like 4x-y=9d
anonymous
  • anonymous
ok well you should also probably ask your teacher this too cause in math it's really important to know why things happen
anonymous
  • anonymous
yeah exactly
anonymous
  • anonymous
kk i dont have a teacher
anonymous
  • anonymous
oh...how does that work?
anonymous
  • anonymous
well my mom is my teacher but my mom is in the hospital
anonymous
  • anonymous
ohh ok
anonymous
  • anonymous
ya
anonymous
  • anonymous
how do i get x by it's self
anonymous
  • anonymous
sorry if you dont mind me asking, what grade are you in? like technically, like your age
anonymous
  • anonymous
14 in 9
anonymous
  • 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
anonymous
  • anonymous
sorry again, (none of my business i know) but why don't you go to school?
anonymous
  • anonymous
so what i got was 4x=9dy drama and lot of fighting
anonymous
  • anonymous
that's right except that it's d^2 not just d
anonymous
  • anonymous
oh, well i'm sorry. hope it works out, whatever it is
anonymous
  • anonymous
oo k
anonymous
  • anonymous
thank you well we are having hard times my bf just got put in jail for a year
anonymous
  • anonymous
aww :/ Imagine all the people, living life in peace... *swaying to the awesome music* sorry, only thing i could think of
anonymous
  • anonymous
It's good that you're doing math and stuff though
anonymous
  • anonymous
lol thank you hes only 15
anonymous
  • anonymous
i thought you couldn't go to jail unless you're an adult? well i suppose different countries
anonymous
  • 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
anonymous
  • anonymous
ohh the kids do what they have to?
anonymous
  • anonymous
ya well know that i look back at what happened it is his own problem
anonymous
  • anonymous
oh. well anyways good luck. time heals
anonymous
  • anonymous
ya kk so know what do i do with 4x=9d^2y
anonymous
  • 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?
anonymous
  • anonymous
you divide 4 on both sides
anonymous
  • anonymous
because what happens on one side you do to the other
anonymous
  • anonymous
yeah! exactly! :D good job
anonymous
  • anonymous
thank you so it would be 2.25 d^2y
anonymous
  • anonymous
wait what? so i had 4x=9d^2 + y and so x= (9d^2 + y)/4
anonymous
  • anonymous
ya and that is what i did then i divided 9/4=2.25

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