anonymous
  • anonymous
Divide: (12+9i)/(3-4i)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
\[\frac{ 12+9i }{ 3-4i }\times \frac{ 3+4i }{ 3+4i }=\frac{ (12+9i)(3+4i) }{ 9+16 }\]
anonymous
  • anonymous
Rationalise the denominator mate....
anonymous
  • anonymous
Thanks forgot about that. U cant have i in the denominator. i was using long division. fail.

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anonymous
  • anonymous
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.
anonymous
  • anonymous
I knew what the answer was. I just forgot how to get it.
anonymous
  • anonymous
ah okay, no worries then.
anonymous
  • anonymous
Can you help me with one more problem?
anonymous
  • anonymous
How do i find an absolute value of a binomial with an i?
anonymous
  • anonymous
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... \[\left| a+ib \right|=\sqrt{a^2+b^2}\]
anonymous
  • anonymous
So "i" just disappears?
anonymous
  • anonymous
Dude haven;t you learnt about absolute values? The absolute value of something is the distance from the origin.
anonymous
  • anonymous
You're finding the distance from the origin to to the point (a, b)
anonymous
  • anonymous
@blahblah_who_cares

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