Question

x² - 8x + 15 = 0 raízes 3 e 5​

Answer 1

Resposta:

x²+8x+15=0

a = 1 b = + 8 c = + 15

Δ = b² - 4.a.c

Δ = (+ 8)² - 4.(1).(+15)

Δ = 64 - 60

Δ = 4

x = - b ± √Δ

2.a

x = - (+8) ± √4

2.1

x= - 8 ± 2

2

x'= - 8 + 2 = - 6 = - 3

2 2

x" = - 8 - 2 = - 10 = - 5

2 2

S[- 5 ; - 3]