Which of the following is a solution of x2 + 4x + 6?
−2 + i times the square root of 2
2 + i times the square root of 2
−2 + three i times the square root of 2
−2 + three i times the square root of 2

Question

Which of the following is a solution of x2 + 4x + 6?
 −2 + i times the square root of 2
2 + i times the square root of 2
−2 + three i times the square root of 2
−2 + three i times the square root of 2

anonymous · Answer

you have a choice
you can use the quadratic formula or you can complete the square 
you pick

anonymous · Answer

actually there is a third choice, namely to cheat

anonymous · Answer

how do i do that, any of it ?

anonymous · Answer

do you know the quadratic formula?

anonymous · Answer

i need a refresher.

anonymous · Answer

the solutions to 
$$ax^2+bx+c=0$$ are 
$$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$$
in your case $a=1,b=4,c=6$ but also in your case completing the square is easier

anonymous · Answer

lets solve 
$$x^2+4x+6=0$$ by completing the square 
ready?

anonymous · Answer

sorry i was working it out xD

anonymous · Answer

ok take your time

anonymous · Answer

so far I got |dw:1438546685018:dw|