Here's the question you clicked on:
blahblah_who_cares
Divide: (12+9i)/(3-4i)
\[\frac{ 12+9i }{ 3-4i }\times \frac{ 3+4i }{ 3+4i }=\frac{ (12+9i)(3+4i) }{ 9+16 }\]
Rationalise the denominator mate....
Thanks forgot about that. U cant have i in the denominator. i was using long division. fail.
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.
I knew what the answer was. I just forgot how to get it.
ah okay, no worries then.
Can you help me with one more problem?
How do i find an absolute value of a binomial with an i?
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... \[\left| a+ib \right|=\sqrt{a^2+b^2}\]
So "i" just disappears?
Dude haven;t you learnt about absolute values? The absolute value of something is the distance from the origin.
You're finding the distance from the origin to to the point (a, b)