## AmTran_Bus one year ago quad formula help

1. AmTran_Bus

|dw:1440200122850:dw|

2. AmTran_Bus

does the two also apply to what is under the root?

3. AmTran_Bus

So is it|dw:1440200448959:dw|

4. arindameducationusc

5. AmTran_Bus

help me man by book says it is z=1+ or - sqrt (-4) or z=1 + or - 2i

6. arindameducationusc

|dw:1440200560042:dw|

7. arindameducationusc

do you know the defination of 'i'?

8. arindameducationusc

i=sqrt(-1)

9. AmTran_Bus

Yea.

10. AmTran_Bus

11. AmTran_Bus

Like I know the 2 cancels but what about the rest

12. AmTran_Bus

@arindameducationusc

13. arindameducationusc

yes yes have patience..

14. jdoe0001

$$\bf \textit{quadratic formula}\\ {\color{blue}{ 1}}z^2{\color{red}{ -2}}z{\color{green}{ +5}}=0 \qquad \qquad z= \cfrac{ - {\color{red}{ b}} \pm \sqrt { {\color{red}{ b}}^2 -4{\color{blue}{ a}}{\color{green}{ c}}}}{2{\color{blue}{ a}}}$$ what does that give you?

The denominator "2" applies to both terms of the numerator.

16. AmTran_Bus

@radar exactly what I needed. So it is actually 1+ sqrt(-4) which is 1+ 2i

17. arindameducationusc

Yes. Note there are two complex solutions

19. AmTran_Bus

1+ or - 2i

Correcto

21. AmTran_Bus

thanks a million