Help me please
screencap in comments.
best answer rewarded

- Jravenv

Help me please
screencap in comments.
best answer rewarded

- jamiebookeater

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- Jravenv

##### 1 Attachment

- Astrophysics

|dw:1434589442935:dw|

- Astrophysics

Try it out and see what you get and I will tell you if you're doing it right or not :)

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## More answers

- Jravenv

I honestly don't know how to do that, Can you walk me through it? :(

- Astrophysics

|dw:1434589708339:dw|

- Astrophysics

|dw:1434589758515:dw| can you finish it off...

- Astrophysics

You'll have to take the conjugate after to, it's a fun problem :P.

- Astrophysics

I will be back in a few minutes, please try it, and if you are stuck don't worry I will help you once I'm back!

- Jravenv

I don't get it :/

- anonymous

is it clear that
\[\sqrt 8\times \sqrt 2=\sqrt {16}=4\]

- Jravenv

How does the square root of 16=4 though?

- anonymous

because \(4^2=4\times 4=16\) right?

- anonymous

since \(4^2=16\) then \(\sqrt{16}=4\)

- Jravenv

Ohh yeah okay, I'm following

- Astrophysics

Hey, I'm back, hi satellite :P

- Astrophysics

Ok so where are you now, \[4 - \sqrt{8}x = 11\] can you collect like terms?

- Jravenv

There aren't any are there?

- Astrophysics

Notice the 4 and 11, so we have \[-\sqrt{8}x = 11-4 \implies -\sqrt{8}x = 7\] does that make sense?

- Jravenv

Yes sir!

- Astrophysics

Ok now we just divide \[x = -\frac{ 7 }{ \sqrt{8} }\] so far so good?

- Astrophysics

But if you compare this with your answers, you will notice it's not one of the choices right? That's the tricky part hehe.

- Jravenv

Well shucks, what do we got to do?

- Astrophysics

\[-\frac{ 7 }{ \sqrt{8} } \times \frac{ \sqrt{8} }{ \sqrt{8} }\] we have to multiply by sqrt(8) because we can not have the sqrt(8) at the bottom.

- Jravenv

I don't know how I would multiply that

- Astrophysics

\[-\frac{ 7 }{ \sqrt{8} } \times \frac{ \sqrt{8} }{ \sqrt{8} } = -\frac{ 7 \sqrt{8} }{ 8 }\] because \[\sqrt{8} \times \sqrt{8} = \sqrt{64} = 8\]

- Astrophysics

:D

- Astrophysics

Does that all make sense?

- Jravenv

Yes sir! Thank you! You were very thorough and patient with me I am very thankful

- Astrophysics

Np ^.^

- Astrophysics

You could also simplify it to \[-\frac{ 7 \sqrt{2} }{ 4 }\] I think this is what they want

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