anonymous
  • anonymous
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)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Nnesha
  • Nnesha
http://openstudy.com/study#/updates/55fb1a4de4b0027d1e7718eb do you know you can ask question if you didn't understand anything ?
anonymous
  • anonymous
I was about to tag you sorry; it wouldn't let me click on the question. Sorry!!
Nnesha
  • Nnesha
its okay.

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anonymous
  • anonymous
Okay; so can you give me the formula again? c:
Nnesha
  • Nnesha
apply distributive property distribute parentheses by outside number/variable \[\huge\rm \color{reD}{a}(b+c) =\color{red}{a} ·b +\color{reD}{a}·c =\color{ReD}{a}b +\color{ReD}{a}c\]
Nnesha
  • Nnesha
|dw:1442521669737:dw| multiply both terms by 4i 4i times 6=? 4i times -10i=?
anonymous
  • anonymous
4i * 6 = 24i 4i * -10i = 40
Nnesha
  • Nnesha
yes right so 40 +24i isn't equivalent to -40+24i
Nnesha
  • Nnesha
now try B) 4i(6+10i) distribute
anonymous
  • anonymous
I am so sorry that it took so long!! So we're going to doing this 4i * 6 = and 4i * 10i =
anonymous
  • anonymous
@nnesha
Nnesha
  • Nnesha
yes right
Nnesha
  • Nnesha
so what did yo uget ?
anonymous
  • anonymous
4i * 6 = 24i 4i * 10i = -40 @nnesha
anonymous
  • anonymous
You're doing choice B now right? So is the result equivalent to -40+24i?
anonymous
  • anonymous
Yes, and yes?
anonymous
  • 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
anonymous
  • anonymous
Okay. c: Let me work that out and get back to you.
anonymous
  • anonymous
D is the other answer?
Nnesha
  • Nnesha
yes right 8i(3+5i) 24i and 5i times 8i = 40(-1) so yes

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