Question

as raizes da equacao 2X2- 8X- 10=0

Answer 1

2 x² - 8 x - 10 = 0
Δ = b² - 4.a.c
Δ = (-8)² - 4 . 2 - 10
Δ = 64 + 80
Δ = 144 ⇒√144 = 12
x = - b + ou - 12/2.2
x´= -(-8) +12/4 ⇒8 + 12/ 4 ⇒20/4 = 5
x´´ = 8 - 12 / 4 ⇒  -4/4 = - 1

S = { -1 ; 5 }