poopsiedoodle 2 years ago Can someone explain how to do quadratic equations with complex numbers?

1. precal

yes, that means when you graph your quadratic function, it does not cross the x axis at all

2. precal

|dw:1358903985103:dw|here is an example of a quadratic with complex solutions

3. poopsiedoodle

Okay, but I still need help with solving them.

4. precal

well then post one so we can work it together

5. poopsiedoodle

Okay. Just a second.

6. poopsiedoodle

√(-36) - √(-40) It's one of the example problems that I can't get right.

7. precal

|dw:1358904893711:dw|

8. poopsiedoodle

That makes sense I guess :P

9. precal

this is just complex numbers. Complex numbers can be added, subtracted, multiplied and divided......not a big deal.....electrical engineers use them....

10. poopsiedoodle

11. precal

post it, makes no difference to me.......

12. poopsiedoodle

\[\Huge x^{2}+6x+11 = 0\]

13. precal

|dw:1358905661660:dw|do you see the negative number under the radical

14. precal

that tells you that your solution is complex

15. precal

|dw:1358905735721:dw|

16. poopsiedoodle

OH. Okay. I get it now. Thanks! :D

17. precal

another way to do it is by completing the square but the quadratic formula is easier to do it by.

18. precal

yw

19. poopsiedoodle

Actually, I don't :<

20. precal

close this problem and post a new one. You can send me a notification and we can work on another one together