Question

How can I find X here? |Solving for X|
2x + 1 = x2 + 4x + 18

Answer 1

@tHe_FiZiCx99

Answer 2

@Zarkon

Answer 3

Ok, looks like I can use the quadratic formula. Can someone help me apply it?

Answer 4

@jigglypuff314

Answer 5

first get all the stuff to one side

Answer 6

Do you mean combine like terms?

Answer 7

And get X to one side?

Answer 8

subtract 2x and 1 from both sides
then quadratic

Answer 9

Ok, thanks. Check my answer when I'm done?

Answer 10

sure :)

Answer 11

Ok, I have the problem set up.

Answer 12

\[x = \frac{ -2x plusorminus \sqrt{4x^2 - 4(x^2 * 17)} }{ 2x^2 }\]

Answer 13

plusorminus = ±

Answer 14

Ugh.

Answer 15

Did I set up the equation correctly?

Answer 16

\[\pm \]

Answer 17

Yes, I couldn't find it lol

Answer 18

ummm the quadratic equation is just for the coefficients
the whole point was to take the x's out of there to solve for it :)

Answer 19

\[\frac{ -2\pm \sqrt{(2)^2-4(1)(17)} }{ 2(1) }\]

Answer 20

oh wait O_O
there are no real answers!!!

Answer 21

@superdude123 ... are you learning imaginary?

Answer 22

Sorry!

Answer 23

Why are there no real answers?

Answer 24

I graphed it an they don't intersect, which means there is no answer.

Answer 25

square root ( 4 - (4*17) ) = squareroot(negative) = imaginary number

Answer 26

So should I say that the answer is extraneous?

Answer 27

Or the equation, rather.

Answer 28

um more like there are no real solutions

Answer 29

Prime?

Answer 30

umm I just think it's no real solutions
unless you have options?

Answer 31

Nope, that's fine. Thanks for your help. :)