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blahblah_who_cares

  • 3 years ago

Divide: (12+9i)/(3-4i)

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  1. Azteck
    • 3 years ago
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    \[\frac{ 12+9i }{ 3-4i }\times \frac{ 3+4i }{ 3+4i }=\frac{ (12+9i)(3+4i) }{ 9+16 }\]

  2. Azteck
    • 3 years ago
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    Rationalise the denominator mate....

  3. blahblah_who_cares
    • 3 years ago
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    Thanks forgot about that. U cant have i in the denominator. i was using long division. fail.

  4. Azteck
    • 3 years ago
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    Mate. If you need the answer to refer to when you do it. Here's what you want to get as your answer. 3i is the answer.

  5. blahblah_who_cares
    • 3 years ago
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    I knew what the answer was. I just forgot how to get it.

  6. Azteck
    • 3 years ago
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    ah okay, no worries then.

  7. blahblah_who_cares
    • 3 years ago
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    Can you help me with one more problem?

  8. blahblah_who_cares
    • 3 years ago
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    How do i find an absolute value of a binomial with an i?

  9. Azteck
    • 3 years ago
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    absolute value of a complex number means the distance of the curve of the complex number. To find the distance of complex number curve, you just use pythagoras... \[\left| a+ib \right|=\sqrt{a^2+b^2}\]

  10. blahblah_who_cares
    • 3 years ago
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    So "i" just disappears?

  11. Azteck
    • 3 years ago
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    Dude haven;t you learnt about absolute values? The absolute value of something is the distance from the origin.

  12. Azteck
    • 3 years ago
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    You're finding the distance from the origin to to the point (a, b)

  13. Azteck
    • 3 years ago
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    @blahblah_who_cares

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