Question

Solve
kx^2-4x+k=0
Could I get please get a nice neat explanation, these problems make me get stuck.

Answer 1

okay I am here to help you

Answer 2

You need to use the discriminant
\[b^2-4ac\]

Answer 3

thanks AZteck I forget what it was called ..

Answer 4

wait that is the quad form right still?

Answer 5

The discriminant comes from the quadratic formula.
\[x=\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }\]
The discriminant is the expression in the square root as you can see.

Answer 6

yep that is what I was about to type when I had a brain fart lol

Answer 7

because an problem that has a x^2 and =0 we that form to slove

Answer 8

So @AIK
\[b^2-4ac=?\]
a=k
b=-4
c=k
Sub in those values in the discriminant and solve for k.

Answer 9

yep that is right sir

Answer 10

I got k=2
is that right?

Answer 11

AIK show me how you got that answer, I want to see the work if you don't mind?

Answer 12

-4^2 -4k^2=0

Answer 13

how do i make a multiply sign?

Answer 14

use your x key

Answer 15

-4^ -4 k(times)k

Answer 16

16-4k^2=0

Answer 17

whoa

Answer 18

b is -4 and a&c are k ?

Answer 19

reminder that is -4 raised to the -4 power not 4^4

Answer 20

but you four -4 fours so the result there is negative

Answer 21

so -4^-4 is what??

Answer 22

b^2−4ac
its squared right?

Answer 23

so -4 times -4 would be positive 16

Answer 24

yes it is squared

Answer 25

yes it is 16 postive

Answer 26

so 16 - 4k^2 =0
-> -4k^2= -16 [x-1]
-> 4k^2=16
-> k^2= 4
-> k= 2

Answer 27

with the x i mean multiplies

Answer 28

okay that is correct nice job

Answer 29

so why did you say i was wrong o.o?

Answer 30

no I wasn't saying you were wrong, I wanted to see if you knew or were just gueesing is all..

Answer 31

When I help here I try to teach and help students

Answer 32

I am not a teacher myself, just someone that is gifted in math is all

Answer 33

okay then for some reason it made me think i got it wrong somehow, so I went over my math again

Answer 34

no sorry my fault that wasn't the point here. I was trying to get you to do the steps is all. Forgive me next time I will be more clearer on that point okay..

Answer 35

x=+/- 2

Answer 36

yes that is correct :)

Answer 37

You cannot only get a positive value when you square root a number.

Answer 38

You always get a negative value with it as well. Remember that @AIK

Answer 39

Azteck could have done something here better? I feel like AIK thinks I thought he was wrong tips?

Answer 40

I