## rkent100 4 years ago can someone help me with complex numbers and the quadratic equaion

1. chaise

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

2. rkent100

i don't get multiplying and dividing complex numbers

3. chaise

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

4. rkent100

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

5. chaise

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

6. fiddlearound
7. rkent100

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

8. chaise

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.

9. Denebel

\[12-21i+24i-42i^2\] \[12-21i+24i+42\] 54+3i \[i^2\] becomes -1.