Question

(Na imagem)

A)
B)
C)
D)
E)

Answer 1

Resposta:

∆= b² - 4ac

∆ = (-8)² - 4 × 1 × 15

∆ = 64 - 60

∆ = 4

x' + x" = -b/a

x' . x" = c/a

$\frac{ - b}{a} = \frac{ - ( - 8)}{1} = \frac{8}{1} = 8 \\ \\ \frac{c}{a} = \frac{15}{1} = 15$

Alternativa E