Question

.,

Answer 1

So add 7 from both sides.

Answer 2

here is link to lesson on completing the square

http://www.purplemath.com/modules/solvquad3.htm

Answer 3

yes
what is half of 2?

Answer 4

1- what is the next step?

Answer 5

square that number

Answer 6

here is a link to a lesson with video:
http://www.youtube.com/watch?v=bNQY0z76M5A

Answer 7

and add it to both sides
\[(x+1)^2=7+1=8\]

Answer 8

then take the square root of both sides, don't forget the \(\pm\)
that gets you to
\[x+1=\pm\sqrt8\] and you are done once you subtract \(1\) from both sides

Answer 9

In case you're wondering how he got \((x+1)^2=8\),
\(x^2+2x-7=0\)
\(x^2+2x=7\)
\(x^2+2x+1=7+1\)
\((x+1)^2=8\)

Answer 10

hope we helped you :)