$x^2+12x+37$ = 0

D = $6^2-37$ = $36$ $-$ $37$ = $-1$

Da die Diskriminante D < 0 ist, hat die quadratische Gleichung keine Lösunng.

L ={}

$x^2-8x-9$ = 0

sortieren

$x^2-8x-9$ = 0

D = ${\left(-4\right)}^2-\left(-9\right)$ = $16$$+$ $9$ = $25$

x_1,2 = $4$ ± $\sqrt{25}$

x₁ = $4$ - $5$ = -1

x₂ = $4$ + $5$ = 9

L = { $-1$; $9$}