Question

Solve x2 + 2x + 9 = 0.



x equals negative 2 plus or minus 4 I square root of 2


x equals negative 2 plus or minus 2 I square root of 2


x equals negative 1 plus or minus 4 I square root of 2


x equals negative 1 plus or minus 2 I square root of 2

Answer 1

\[x^2+2x+9=0\\
x^2+2x=-9\] is a start
then what is half of 2?

Answer 2

1

Answer 3

ok and \{1^2=1\) so next step is \[(x+1)^2=-9+1\\
(x+1)^2=-8\]

Answer 4

you good from there? take the square root, get \[x+1=\pm\sqrt{-8}\] and so on

Answer 5

i really have no clue how to do any of this