Question

Use the quadratic formula to solve the equation.
x^2-x=-2
Please help, I dont' know why this one is so confusing to me, but I can't get it.

Answer 1

x^2-x=-2
x^2-x+2 =0
ax^2 +bx +c =0
\[x=(-b \pm \sqrt{b^2-4ac)}/(2a)\]

Answer 2

put the corresponding value to the formula

Answer 3

x^2-x+2=0
Use quadratic formula:
ax^2-bx+2=0
a=1, b=-1, c=2

Answer 4

so the x's are equal to 1 right?

Answer 5

since Δ<0, you will not get real solutions..

Answer 6

i is the imaginary number\[i=\sqrt{-1}\]

Answer 7

so was my answer close? I thought I was completely wrong and deleted it.

Answer 8

Hmm.. close but not correct... don't be afraid to make mistakes!

Answer 9

Sorry this is really confusing to me.

Answer 10

So, can you try again to get the answer?

Answer 11

I can try, but I don't understand still how it works. With no real numbers, it totally confuses me.

Answer 12

show you steps please~

Answer 13

trying to go over every thing you have said so far to see if I can comprehend it.

Answer 14

i deleted my answer.. i hope you can try...perhaps you can start with substituting the numbers into the formula and ask whatever you don't understand so we can help

Answer 15

I don't understand the imaginary number. Where does that come in?

Answer 16

what is the formula I need to use?
Is it the ax^2+bx+2?

Answer 17

ax^2 +bx +c =0 is the general form of a quadratic equation. Before you apply the quadratic formula, you have to make the equation into general form first

Answer 18

then use the quadratic formula
\[x=(-b \pm \sqrt{b^2-4ac)}/(2a)\]

Answer 19

Ok now my nerves are gone. I have gone beyond confusion now. LOL

Answer 20

that means you understand it now?

Answer 21

so when you say to put it into general form...you mean its not already in general form the way that it is?

Answer 22

No that means that confusion is an understatement. Now I am just plain lost!

Answer 23

x^2-x=-2
it is not in a general form

Answer 24

but when you add 2 on both sides, it is in the general form

Answer 25

ok

Answer 26

so you 'll get x^2 -x +2 =0

Answer 27

right ok I got that.

Answer 28

match the coefficient with a, b,c in the general form

Answer 29

a=1, b=-1, c=2

Answer 30

Then put these value into the quadratic formula, and you'll get x

Answer 31

*values

Answer 32

so do I really put in the numbers 1 when putting the values into the formula?

Answer 33

put a=1, b=-1, c=2 into the formula

Answer 34

ok got that...here is what it looks like;