1. Jravenv

2. Astrophysics

|dw:1434589442935:dw|

3. Astrophysics

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

4. Jravenv

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

5. Astrophysics

|dw:1434589708339:dw|

6. Astrophysics

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

7. Astrophysics

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

8. 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!

9. Jravenv

I don't get it :/

10. anonymous

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

11. Jravenv

How does the square root of 16=4 though?

12. anonymous

because $$4^2=4\times 4=16$$ right?

13. anonymous

since $$4^2=16$$ then $$\sqrt{16}=4$$

14. Jravenv

Ohh yeah okay, I'm following

15. Astrophysics

Hey, I'm back, hi satellite :P

16. Astrophysics

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

17. Jravenv

There aren't any are there?

18. Astrophysics

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

19. Jravenv

Yes sir!

20. Astrophysics

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

21. 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.

22. Jravenv

Well shucks, what do we got to do?

23. 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.

24. Jravenv

I don't know how I would multiply that

25. Astrophysics

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

26. Astrophysics

:D

27. Astrophysics

Does that all make sense?

28. Jravenv

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

29. Astrophysics

Np ^.^

30. Astrophysics

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