Question

nothing

Answer 1

a = 1 , b = 2 , c = 9
use the quadratic formula .

Answer 2

x = -2 +- √ 4 - 4(9) / 2
x = - 2 +- √-32 / 2
\[x = \frac{ -2 \pm \sqrt{16} \times \sqrt{2} \times i }{ 2 }\]
\[x= \frac{ -2 \pm 2i \sqrt{2} }{ 2 }\]
\[x = -1 \pm 2i \sqrt{2}\]

Answer 3

\[i = \sqrt{-1}\]