Question

Rearrange x=2/3 y squared +4

Answer 1

ready to work on this together?

Answer 2

that would be great

Answer 3

Sweeet! Ok, first thing we want to do is to try to get the y on one side and the rest of the junk on the other side of the equals sign.

Answer 4

Easiest thing to remove is the +5. How do we get rid of it from the right side of the equals sign?

Answer 5

-4

Answer 6

2/3y^2=x-4
multiply by 3/2 next?

Answer 7

Oooohhhh I'm sorry. I mixed you up with someone else. -4 IS correct. Sorry!

Answer 8

You're absolutely correct. multipy by 3/2 (which is technically the same as dividing by 2/3)

Answer 9

y^2=3/2x-4
*then remove the root?

Answer 10

power of two i mean

Answer 11

Yes, to do this, you square root everything on both sides.

Answer 12

y=sqrt of 3/2x-4 ????

Answer 13

wolfram alpha gives me a different solution to that

Answer 14

Weird. Lemme write this out in pencil then.

Answer 15

I got the same answer. :/

Scroll down to where it says "answers for y"

Answer 16

they give me this....is that the exact same sort of answer as what i got?

Answer 17

Yup! They just put a separate square root on each expression.
It's still the same answer.

Answer 18

their answer actually appears to look like sqrt3/2 multiplied by sqrtx-4

Answer 19

Basically, they didn't distribute the square root in wolfram alpha.

Answer 20

Yup! Same thing :D

Answer 21

For example: Square root of 4 times square root of four. How much is that?

Answer 22

4

Answer 23

I had the right answer the first time I did it. I guess I just needed to confirm it!

Answer 24

and if you combined the suare root and said "square root of (4 times 4)"?

Answer 25

No problemo.

Answer 26

I sorta assumed that, just good to hear someone else confirm it ie "sqrt(4 x 4)

Answer 27

hey uber, I asked this question last night and "mathlearner" gave me a different answer....I think his is wrong. http://openstudy.com/groups/mathematics#/groups/mathematics/updates/4e180a500b8bc2275746b45b

Answer 28

Hmmm.... it might be correct, but that is very weird notation. Lemme double check.

Answer 29

According to wolfram, it's false.

http://www.wolframalpha.com/input/?i=x%3D+2%2F3+y%5E2+%2B+4+%3D+sqrt%282-4x%2F3x%29

Answer 30

I think he has too many X's. They should cancel out the way he wrote it.

Answer 31

2x/3x should just equal 2/3 with no x

Answer 32

you're right.he does have one too many Xs.