## anonymous one year ago Which expressions are equivalent to -40+24i? Choose exactly two answers that are correct. A. 4i(6-10i) B. 4i(6+10i) C. 8i(3-5i) D. 8i(3+5i)

1. Nnesha

http://openstudy.com/study#/updates/55fb1a4de4b0027d1e7718eb do you know you can ask question if you didn't understand anything ?

2. anonymous

I was about to tag you sorry; it wouldn't let me click on the question. Sorry!!

3. Nnesha

its okay.

4. anonymous

Okay; so can you give me the formula again? c:

5. Nnesha

apply distributive property distribute parentheses by outside number/variable $\huge\rm \color{reD}{a}(b+c) =\color{red}{a} ·b +\color{reD}{a}·c =\color{ReD}{a}b +\color{ReD}{a}c$

6. Nnesha

|dw:1442521669737:dw| multiply both terms by 4i 4i times 6=? 4i times -10i=?

7. anonymous

4i * 6 = 24i 4i * -10i = 40

8. Nnesha

yes right so 40 +24i isn't equivalent to -40+24i

9. Nnesha

now try B) 4i(6+10i) distribute

10. anonymous

I am so sorry that it took so long!! So we're going to doing this 4i * 6 = and 4i * 10i =

11. anonymous

@nnesha

12. Nnesha

yes right

13. Nnesha

so what did yo uget ?

14. anonymous

4i * 6 = 24i 4i * 10i = -40 @nnesha

15. anonymous

You're doing choice B now right? So is the result equivalent to -40+24i?

16. anonymous

Yes, and yes?

17. anonymous

alright. so that means choice B is one of the right answers. Now, you just have to do the same thing with choice C & D

18. anonymous

Okay. c: Let me work that out and get back to you.

19. anonymous