## Yazzy2041 3 years ago I need help with this problem 2sqrt (-4)-94

1. beknazar23

4i-94 which i = sqrt(-1)

2. Yazzy2041

I do not understand how to work the problem out at all .

3. Yazzy2041

|dw:1345597004779:dw|

4. beknazar23

|dw:1345597202428:dw|

5. Yazzy2041

Where did the sprt(-1) come from ?

6. beknazar23

it's just assignment, we guess it is equal to variable "i" kind of abstraction, mathematicians use

7. Yazzy2041

I still do not understand

8. Yazzy2041

Write the following expressions in standard form.

9. beknazar23

you can read it in wikipedia: http://en.wikipedia.org/wiki/Imaginary_number

10. hawkfalcon

@Yazzy2041 $-1 = i^2$ Thats what he's saying

11. Yazzy2041

I do not understand the breakdown this is my first time doing this @hawkfalcon

12. hawkfalcon

It's okay:) Thanks for fanning me:P

13. hawkfalcon

$2\sqrt (-4)-94$ $2 i \sqrt (4)-94$ $2i2-94$ How far do you need to go?

14. hawkfalcon

$4i - 94$

15. Yazzy2041

thanks

16. hawkfalcon

No problem, make sense? It it has a negative value in the radical, you make it imaginary:P