Question

Solve: x2 + 2x - 1 = 0

Answer 1

i'm pretty sure you know how to factor that :-

Answer 2

That can't be factored, honestly.

Answer 3

i got \[-2\pm \sqrt{8}> divided by 2\]

Answer 4

oh wait

Answer 5

Looks alright to me. You can write that as \(-1 \pm \sqrt 2\)

Answer 6

factor 8

Answer 7

square root of 8 is a long decimal

Answer 8

\[x^2+2x=1,add~1 ~\to~both~sides\]

Answer 9

\[\sqrt 8 = 2 \sqrt 2\]

Answer 10

\[\huge\rm \frac{ -2 \pm \sqrt{4 \times 2}}{ 2}\]
yep right that's why you to factor 8
4 times 2 =8
now take square root of 4

Answer 11

have**

Answer 12

thats what i got, but what next?

Answer 13

Then you've solved it.

Answer 14

1 + √2 and -1 - √2
-1 + √2 and -1 - √2
-1 + √3 and -1 + √2
-1 - √2 and 1 + √2

Answer 15

\[\huge\rm \frac{ -2 \pm 2\sqrt{ \times 2}}{ 2}\]
2 is common so take it out

Answer 16

oh

Answer 17

so,..

Answer 18

i will fan all of u if you help me with 3 questions