Resposta :
y = x² - 6x - 8
0 = x² - 6x - 8
x² - 6x - 8 = 0
a = 1 , b = - 6 , c = - 8
Δ = b² - 4.a.c
Δ = (- 6 )² - 4.1.(-8)
Δ = 36 - 36
Δ = 0
#Quandoo dellta foor ZERO acabaa a contta .. !
0 = x² - 6x - 8
x² - 6x - 8 = 0
a = 1 , b = - 6 , c = - 8
Δ = b² - 4.a.c
Δ = (- 6 )² - 4.1.(-8)
Δ = 36 - 36
Δ = 0
#Quandoo dellta foor ZERO acabaa a contta .. !