$\"\"$

The equation is $\"\"$ .

$\"\"$

Compare the above equation with standard form of quadratic equation $\"\"$ .

a = 1, b = $\"\"$ 2, and c = 13.

The quadratic formula $\"\"$ .

$\"\"$

$\"\"$ (Substitute : a = 1, b = $\"\"$ 2, and c = 13)

$\"\"$

$\"\"$ (The imaginary unit $\"\"$ ) $\"\"$

The solution of $\"\"$ .