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Destinyyyy

  • one year ago

Possible help with a few questions (refresher and check)

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  1. Destinyyyy
    • one year ago
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    Divide and express the result in standard form. 6i/9-8i

  2. Destinyyyy
    • one year ago
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    I got -48+54i/145 but im incorrect

  3. Saurabh135
    • one year ago
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    i thnk u right..

  4. Destinyyyy
    • one year ago
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    It says the correct answer is --> - 48/145 + 54i/145

  5. Saurabh135
    • one year ago
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    oh...then tell me can't u write (a+b)/c= a/c + b/c

  6. Saurabh135
    • one year ago
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    oh...then tell me can't u write (a+b)/c= a/c + b/c

  7. Destinyyyy
    • one year ago
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    I thought it was the same thing

  8. phi
    • one year ago
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    standard form for a complex number is a + bi where a is the real part and b the imag part. they want you to divide through by the 145 so that you have a real part -48/145 and an imaginary part 54/145 i

  9. Destinyyyy
    • one year ago
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    Okay so I have to write it separate like that when it says standard form with a fraction?

  10. Saurabh135
    • one year ago
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    yeah u hv to seperate in form of a+ib

  11. phi
    • one year ago
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    yes

  12. Destinyyyy
    • one year ago
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    Great more stuff I have to remember.. Okay thank you for explaining that

  13. phi
    • one year ago
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    yes, math has a lot of memorizing. but it's not like learning French ... it seems like they have a different word for everything.

  14. Destinyyyy
    • one year ago
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    True.

  15. Destinyyyy
    • one year ago
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    Perform the indicated operation and write in standard form a+bi. 5 square root -64 + 6 square root -25 .... I cant remember how to solve this one -.-

  16. Destinyyyy
    • one year ago
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    @phi

  17. phi
    • one year ago
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    write the \( \sqrt{-64} \) as \( \sqrt{64}\cdot \sqrt{-1} \)

  18. anonymous
    • one year ago
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    \[5\sqrt{-64} + 6\sqrt{-25}\]\[=5\sqrt{64}\sqrt{-1}+6\sqrt{25}\sqrt{-1}\]This help any?

  19. phi
    • one year ago
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    and use the short-hand "i" for sqr(-1)

  20. Destinyyyy
    • one year ago
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    That turns into 5 square root 64i +6 square root 25i right? Or am I way off?

  21. phi
    • one year ago
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    yes, but sqr(64) is a nice number ditto sqr(25)

  22. anonymous
    • one year ago
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    Yes, but you know sqrt(64) and sqrt(25)

  23. anonymous
    • one year ago
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    Sorry. I'm out. Keep up the good work.

  24. Destinyyyy
    • one year ago
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    So now I have to make them into smaller numbers...

  25. phi
    • one year ago
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    yes. you should know them, but you can use a calculator if you don't

  26. Destinyyyy
    • one year ago
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    8i and 5i

  27. phi
    • one year ago
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    ok, and you now have 5*8*i + 6*5*i (I put in the multiply signs to make it clearer) that can be simplified.

  28. Destinyyyy
    • one year ago
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    40i+30i 70i^2 70(-1) -70

  29. phi
    • one year ago
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    it is 40 i's plus 30 more i's

  30. Destinyyyy
    • one year ago
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    Oops so its 70i

  31. phi
    • one year ago
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    yes

  32. Destinyyyy
    • one year ago
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    Okay thank you... 3 more to go

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