## anonymous 5 years ago what is square root -108 + swuareroot -27 ????

1. anonymous

2. anonymous

where is the equation generator

3. anonymous

the button that says equation on the other side of the post button

4. anonymous

Or you could just post it to wolframalpha since you're not really trying to get help as much as just get the answer.

5. anonymous

$\sqrt{-6}(2+ \sqrt{-8})$

6. anonymous

can you explain how to do it if yu can please and try to ignore polpak i am trying to get help hence on y i am posting questions like everyone else

7. anonymous

you know that $\sqrt{i }=\sqrt{-1}$ and that $\sqrt{ab}=\sqrt{a}\sqrt{b}$

8. anonymous

yes

9. anonymous

multiply the $\sqrt{-6}$ and show me what you get

10. anonymous

so your saying break down the -6 and then muliply it by the whole equation

11. anonymous

multiply the $\sqrt{-6}$ in first then show me what you get

12. anonymous

$2\sqrt{3}$

13. anonymous

$\sqrt{-6} \times 2= ?$

14. anonymous

$2\sqrt{-6}=2i \sqrt{6}$

15. anonymous

yes because there is an invisble -1 which equals 1

16. anonymous

*i

17. anonymous

the $\sqrt{-1}$ is an imaginary number and we call this $i$

18. anonymous

now multiply $\sqrt{-6}\sqrt{-8}$=?

19. anonymous

using the rule $\sqrt{ab} =\sqrt{a}\sqrt{b}$