## blahblah_who_cares Group Title Divide: (12+9i)/(3-4i) one year ago one year ago

1. Azteck Group Title

$\frac{ 12+9i }{ 3-4i }\times \frac{ 3+4i }{ 3+4i }=\frac{ (12+9i)(3+4i) }{ 9+16 }$

2. Azteck Group Title

Rationalise the denominator mate....

3. blahblah_who_cares Group Title

Thanks forgot about that. U cant have i in the denominator. i was using long division. fail.

4. Azteck Group Title

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 Group Title

I knew what the answer was. I just forgot how to get it.

6. Azteck Group Title

ah okay, no worries then.

7. blahblah_who_cares Group Title

Can you help me with one more problem?

8. blahblah_who_cares Group Title

How do i find an absolute value of a binomial with an i?

9. Azteck Group Title

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 Group Title

So "i" just disappears?

11. Azteck Group Title

Dude haven;t you learnt about absolute values? The absolute value of something is the distance from the origin.

12. Azteck Group Title

You're finding the distance from the origin to to the point (a, b)

13. Azteck Group Title

@blahblah_who_cares