Question

  equação de 2º grau 
x2 + 6x + 5 = 0

Answer 1

Olá, Alscesum!

x² + 6x + 5 = 0
a = 1
b = 6
c = 5
Δ = b² - 4ac
Δ = 6² - 4.1.5
Δ = 36 - 20
Δ = 16

-b +- raiz de delta / 2.a
-6 +- raiz de 16 / 2.1
-6 +- 4/2

Tiraremos x' e x'':

x'
-6 + 4/2 = -2/2 = -1

x''
-6 - 4/2 = -10/2 = -5

Answer 2

$x^{2} + 6x + 5 = 0 \\ \\ \Delta = 6^2 - 4.1.5 \\ \Delta = 16 \\ \\ x = \frac{-6\pm 4 }{2} \\ \\ x' = \frac{-6 +4}{2} = -1 \\ \\ x'' = \frac{-6-4}{2} = -5 \\ \\ \boxed{S \{-1;-5\}}$