Question

fórmula de baskara X2-2X-3

Answer 1

Δ = 4 + 12
Δ = 16 

x = -2 +-√16/2
x = -2 +-4/2

x' = 2+4/2 = 3

x'' = 2-4/2 = -1 

Answer 2

Equação do 2° Grau!!

x² - 2x - 3 =0

A= 1
B= - 2
C= - 3

∆= b² - 4ac

∆= ( - 2)² - 4 • 1 • ( - 3)
∆= 4 + 12
∆= 16

x= - b ± √∆/2a

x= - ( - 2) ± √16 / 2 • 1
x= 2 ± 4 / 2

x'= 2 + 4/2 = 6/2 =3
x"= 2 - 4/2 = - 2/2 = - 1

S= ( - 1 , 3)