Resposta ↓
Valor da soma de x' e x" = (- 2)
Explicação passo-a-passo:
x² + 2x - 15 = 0
Coeficientes :
a = 1
b = 2
c = - 15
Δ = b² - 4.a.c
Δ = 2² - 4.1.(-15)
Δ = 4 + 60
Δ = 64
[tex]x = \cfrac{-b\pm\sqrt{\Delta} }{2.a} \\\\\\x = \cfrac{-2\pm8}{2} \\\\\\x' = \cfrac{-2-8}{2} \\\\\\x' = \cfrac{-10}{2} \\\\\\x' = - 5\\\\\\x" = \cfrac{-2+8}{2} \\\\\\x" = \cfrac{6}{2} \\\\\\x" = 3[/tex]
s = {-5, 3}
Somando :
- 5 + 3
= -2
