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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)

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

  2. anonymous
    • one year ago
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    I was about to tag you sorry; it wouldn't let me click on the question. Sorry!!

  3. Nnesha
    • one year ago
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    its okay.

  4. anonymous
    • one year ago
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    Okay; so can you give me the formula again? c:

  5. Nnesha
    • one year ago
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    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
    • one year ago
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    |dw:1442521669737:dw| multiply both terms by 4i 4i times 6=? 4i times -10i=?

  7. anonymous
    • one year ago
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    4i * 6 = 24i 4i * -10i = 40

  8. Nnesha
    • one year ago
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    yes right so 40 +24i isn't equivalent to -40+24i

  9. Nnesha
    • one year ago
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    now try B) 4i(6+10i) distribute

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

  11. anonymous
    • one year ago
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    @nnesha

  12. Nnesha
    • one year ago
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    yes right

  13. Nnesha
    • one year ago
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    so what did yo uget ?

  14. anonymous
    • one year ago
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    4i * 6 = 24i 4i * 10i = -40 @nnesha

  15. anonymous
    • one year ago
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    You're doing choice B now right? So is the result equivalent to -40+24i?

  16. anonymous
    • one year ago
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    Yes, and yes?

  17. anonymous
    • one year ago
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    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
    • one year ago
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    Okay. c: Let me work that out and get back to you.

  19. anonymous
    • one year ago
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    D is the other answer?

  20. Nnesha
    • one year ago
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    yes right 8i(3+5i) 24i and 5i times 8i = 40(-1) so yes

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