Question

Solve the quadratic equation by completing the square.
x2 + 6x + 7 = 0

Answer 1

I got to :\[\frac{ 6 \pm \sqrt{8} }{ 2 }\]

Answer 2

wouldn't it be -6 ? instead of 6 ?

Answer 3

the choices are:\[36 \pm \sqrt{2}\]
\[-6 \pm \sqrt{11}\]
\[3 \pm \sqrt{11}\]
\[-3 \pm \sqrt{2}\]

Answer 4

yes sorry forgot the -6

Answer 5

because u can simplify that, u know how ?

Answer 6

no I don't know how to simplify it any further. I need to get to one of the above choices but don't understand how.

Answer 7

\(\sqrt 8\) can be written as ?

Answer 8

idk.. Where does the two go in the equation. I tried to divide it but 8/2 doesn't equal 2 or 11

Answer 9

ok, maybe this will help. how can u factorize 8 ?
\(\sqrt{a*a*a}=a\sqrt a\)

Answer 10

Thanks!

Answer 11

so u got the answer ?

Answer 12

yes! it's \[-3 \pm \sqrt{2}\]

Answer 13

thats correct :)