Question

x^2-4x+8=0

Answer 1

What's the question? Are you solving for x?

Answer 2

no real solution
[4 +/- sqrt(16-32)]/2
2 +/- 2i

Answer 3

\[x= (-b \pm \sqrt{b ^{2}-4ac})/2a\]
\[x _{1} = (-(-4)+\sqrt{(-4)^{2}-4\times1\times8} )/ 2\times1\]
\[=(4+\sqrt{16-32} ) / 2\]
\[=( 4+4i)/2\]
=2+2i

\[x_{2} = (-(-4)-\sqrt{(-4)^{2}-4\times1\times8})/2\times1\]
\[=(4-\sqrt{16-32})/2\]
\[=(4-4i)/2\]
=2-2i