can someone help me with complex numbers and the quadratic equaion

Question

chaise · Answer

I'd love to - do you want help with anything specific, or just something broad?

anonymous · Answer

i don't get multiplying and dividing complex numbers

chaise · Answer

You can simply use foil to multiply complex numbers together. When you divide it's a little bit more tricky, you need to multiply by the conjugate of the denominator. Maybe try watching this video :) This guy is good. http://www.youtube.com/watch?v=KPSj4-76eEc

anonymous · Answer

my math teacher said i need to study  quadratic equation before my test tomorrow

chaise · Answer

http://www.youtube.com/watch?v=iulx0z1lz8M It's not too difficult, and really easy to pickup :)

anonymous · Answer

These are good videos about complex numbers: http://www.khanacademy.org/video/complex-numbers--part-1?playlist=Algebra http://www.khanacademy.org/video/complex-numbers--part-2?playlist=Algebra And this is for the quadratic formula: http://www.khanacademy.org/video/introduction-to-the-quadratic-equation?playlist=Algebra

anonymous · Answer

Correction: http://www.khanacademy.org/video/quadratic-equation-part-2?playlist=Algebra

anonymous · Answer

on a recent quiz i got this problem wrong 

find the product: (3+6i)(4-7i)
and i got 7-i.

chaise · Answer

You need to use foil, seems to me you added like-terms. You need to foil.
You should get: 54+3i
You should watch them videos.

anonymous · Answer

$$12-21i+24i-42i^2$$
$$12-21i+24i+42$$
54+3i

$$i^2$$ becomes -1.