Question

Factor x2 − 4x + 5

Answer 1

impossible the normal way..try quadratic formula

Answer 2

is it prime?

Answer 3

a + b = -4
ab = 5

Find a and b. Good luck.

Answer 4

x=-b+or-sqrt b^2 -4ac/2a

Answer 5

quadratic formula :)

Answer 6

math error with quad formula

Answer 7

oh hmm wat other way is there?

Answer 8

none. so it is prime?

Answer 9

idk...but..u should check ur question again///

Answer 10

that is the right question.

Answer 11

well um wait let me try something. give me a minute :)

Answer 12

ok

Answer 13

http://www.purplemath.com/modules/solvquad.htm try reading this. it should help :)

Answer 14

O-O I havent done quadric formula yet so...

Answer 15

oh well its pretty easy all u do is basically just plug in values so, for example a=1 b= -4 c=5 in ur question so u just plug it in this formula :)....

Answer 16

ok thanks!

Answer 17

quadratic formula does not work

Answer 18

yeah...

Answer 19

@britanny_ did you find a or b yet?

Answer 20

oh well i have no idea wat else u could use :(

Answer 21

its not possible

Answer 22

Never say never

Answer 23

but i didnt say never! :o

Answer 24

@Hero lol XD oh my god dude u just made my day :)

Answer 25

How?

Answer 26

never say never XD

Answer 27

Only as it applies to math. It doesn't apply to personal relationships, so don't get your hopes up.

Answer 28

i just think its impossible

Answer 29

lol ok :)

Answer 30

i dont think u can factor it :/

Answer 31

a + b = -4
ab = 5

@physicsboffin It is impossible to solve this?

Answer 32

do this question...i want to learn

Answer 33

me too

Answer 34

lol, it is doable for sure.

Answer 35

then can u please explain? :)

Answer 36

yeah @Hero ...we're watin lol

Answer 37

yep

Answer 38

I've solved plenty just like this before.

Answer 39

just do it..already

Answer 40

i think ur just bluffing to waste our time :p

Answer 41

I'm honestly not bluffing.

Answer 42

then solve it already !!!

Answer 43

wats taking so long?

Answer 44

:)

Answer 45

Just hang on a minute. I can't type and solve at the same time.

Answer 46

we dont want u 2 type...just solve it..giving u 15 minutes

Answer 47

a = -2 + i
b = -2 - i

Answer 48

a + b = -2 + i - 2 - i = (-2 -2) + i - i = -4 + 0 = -4
ab = (-2 + i)(-2 - i) = -2(-2 + i) -i(-2 + i) = 4 -2i + 2i -i^2 = 4 - (-i)^2 = 4 + 1 = 5

Answer 49

I told you it was possible

Answer 50

so what are the factors?

Answer 51

x^2 − 4x + 5
x^2 + (-2 - i)x + (-2 + i)x + 5
x(x -2 - i) + (-2 + i)(x - 2 - i)
(x - 2 - i)(x -2 + i)

Answer 52

oh i see what u did there. u used i as in imaginary number. so overall good job but can we put the i as in the final answer?

Answer 53

x^2 - 4x + 5 = (x - 2 - i)(x - 2 + i)

You can do that

Answer 54

oh ok :) i understand now. thanks. sorry for doubting ur skills sir. :)

Answer 55

I just knew that it was solveable. The truth is, any trinomial of two degree is factorable.

Answer 56

The funny thing is, you still don't know how I solved it. I wanted it to be that way.

Answer 57

i do know how u solved it! :)

Answer 58

Not really. You don't know the method I used though.

Answer 59

well i still understand what u did there :)

Answer 60

This was a very easy one to do. These get much more difficult. You would need to know the method in order to figure it out.

Answer 61

oh is this from college algebra? because im taking that next year

Answer 62

Negative. You won't learn this in college algebra.

Answer 63

Do you want to learn the method?

Answer 64

oh ok :) the thing is that im really nervous about next year because i have to take a lot of advanced classes in math, physics, chem, history etc on college level and im just kinda confused here and there. and yea sure :)

Answer 65

We can use one that has actual zeroes like x^2 + 6x + 7

Answer 66

Hang on

Answer 67

ok :)

Answer 68

Come here:
http://vyew.com/418625/Math