i need help:

- anonymous

i need help:

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- anonymous

with...

- anonymous

\[\sqrt{4x-y}=3d\]

- anonymous

solve for x

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## More answers

- anonymous

You can square both sides, to start with.

- anonymous

kk

- anonymous

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

- anonymous

lol

- anonymous

getting x by itself is getting the actual values.

- anonymous

no i meant like a numerical value

- anonymous

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

- anonymous

ok

- anonymous

i have know idea what to do

- anonymous

did you square both sides?

- anonymous

ya

- anonymous

what did you get

- anonymous

umm idk

- anonymous

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

- anonymous

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

- anonymous

i need to solve for x

- anonymous

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

- anonymous

how do you get ^2

- 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

oh ^2 means sqaure

- anonymous

oo

- anonymous

so you get how to square both sides then?

- anonymous

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

- anonymous

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

- anonymous

ya

- anonymous

that would be 5 ya

- anonymous

yeah this question is pretty much the same thing

- anonymous

oo

- 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

so you square the 3d

- anonymous

yup and also the sqrt 4x-y

- anonymous

so would it be 9d

- anonymous

9d^2 but yeah

- anonymous

kk then what do i do

- anonymous

did you also square the other side?

- anonymous

so would it be 16x-y^2

- 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

so it stays the same

- anonymous

yeah

- anonymous

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

- anonymous

would the square roots still be there

- anonymous

no

- anonymous

k

- anonymous

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

- 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

yeah exactly

- anonymous

kk i dont have a teacher

- anonymous

oh...how does that work?

- anonymous

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

- anonymous

ohh ok

- anonymous

ya

- anonymous

how do i get x by it's self

- anonymous

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

- anonymous

14 in 9

- 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

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

- anonymous

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

- anonymous

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

- anonymous

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

- anonymous

oo k

- anonymous

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

- anonymous

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

- anonymous

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

- anonymous

lol thank you hes only 15

- anonymous

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

- 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

ohh the kids do what they have to?

- anonymous

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

- anonymous

oh. well anyways good luck. time heals

- anonymous

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

- 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

you divide 4 on both sides

- anonymous

because what happens on one side you do to the other

- anonymous

yeah! exactly! :D good job

- anonymous

thank you so it would be 2.25 d^2y

- anonymous

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

- anonymous

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

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