PLEASE HELP!!1

[imported_Lucifer]

Ok I need to find 2 non real solutions. The original equation is x^2+2x+5. I used the quadratic formula to try to find the 2 non real solutions.

a=1
b=2
c=5

-(2)± v(2)^2-4(1)(5)
--------------------------
2(1)

The square root for (2)^2-4(1)(5) comes to -16
I know you cannot square root a - so you have to take the negative from the number like this:

v-1*v16 Square root of 16 is 4, while square root of the -1 is i.

Result:

-2± 4i
-------
2


Ok I am stuck there. What do I do to get the solutions? Do the 4 and the 2 cancel out, leaving me with one solution as -2+2i and the other as -2-2i? I am soo confused.

Thanks for any help!

 

[minendo]

-1-2i and -1+2i

 

[blinky8225]

Divide the 2 by 2, too. You will get -1+2i and -1-2i.

 

[imported_Lucifer]

Originally posted by: minendo
1-2i and 1+2i

So the negative 2 and the postive 2 divide with each other too?

 

[ts3433]

Simplify that fraction and then expand the part with the plus or minus sign so that you have two solutions (alternatively, leave the plus or minus sign in there because that sign means you have two solutions).

 

[minendo]

Originally posted by: Lucifer

Originally posted by: minendo
1-2i and 1+2i

So the negative 2 and the postive 2 divide with each other too?

Yes, you have to divide the whole numerator by denominator to simplify. Do not forget to include your - sign in from of the 1.

 

[imported_Lucifer]

Oh ok yeah I get it know. Thanks for the help guys!!

 

[imported_Lucifer]

Originally posted by: minendo

Originally posted by: Lucifer

Originally posted by: minendo
1-2i and 1+2i

So the negative 2 and the postive 2 divide with each other too?

Yes, you have to divide the whole numerator by denominator to simplify. Do not forget to include your - sign in from of the 1.

Gotcha. Thanks.

 

[ITJunkie]

Man...I have an exam on this stuff tonight so I feel your pain.

 

[imported_Lucifer]

Originally posted by: ITJunkie
Man...I have an exam on this stuff tonight so I feel your pain.

Mine isn't till friday.

 

[GroundZero]

do your own homework!

 

[imported_goku]

Somebody is in HS...

 

[imported_Lucifer]

Originally posted by: goku
Somebody is in HS...

stfu you're 13.

 

[SaturnX]

Damnit man, it's not i, it's j!!! j I tell you! (well me and anyone else in EE)

--Mark