Question

When solving x^2 - 4x = -7 by completing the square what value is added to both sides of the equation?

Answer 1

coefficient of x divided by 2 and then squared

(-4/2)^2=?

Answer 2

Ok so 4? I work it out and 2 and 4. So how do you know which one it is? @CalebBeavers

Answer 3

-4/2=-2

-2^2=4

Answer 4

Ok thanks!

Answer 5

\[x^2-4x=-7\]
\[(x-2)^2=-7+4=-3\]
\[x-2=\pm\sqrt{3}i\]\[x=2\pm\sqrt{3}i\]