Question

X^2 -4x-2=0 X=?

Answer 1

have you learnt the quadratic equation x= +-b sqrt(b^2-4ac)/2bc

Answer 2

yes we tried that and got some rediculous answer when the answer is 4. the back of the book says so

Answer 3

r u sure

Answer 4

becoz if u take 4 nd substitute it into the equation u will not get 0

Answer 5

alright ill give you the actual equation

Answer 6

\[\sqrt{2x+1}+1 = x\]

Answer 7

when you solve it u will get 0=x^2-4x not x^2-4x-2=0

Answer 8

i just realized that sorry for the confusion

Answer 9

its ok

Answer 10

so how do you solve thaat

Answer 11

there 're 2 results on quadratic formula

Answer 12

\[\sqrt{2x+1}\]+1=x

Answer 13

what are they and how do you do them?

Answer 14

im so confused?? i cant understand how you wrote that???

Answer 15

sqrt(2x+1) +1=x

Answer 16

sqrt(2x+1)= x-1

Answer 17

2x+1 = (x-1)^2

Answer 18

2x+1 = x^2-2x+1

Answer 19

0=x^2-4x

Answer 20

0= x(x-4)

Answer 21

0/x= x-4

Answer 22

0=x-4

Answer 23

x=4

Answer 24

oh i didnt know you were allowed to divide by x just to get rid of it

Answer 25

u can