Question

e) x² + 2x - 8 = 0
a) 2 e-8
b)-4 e 2
C) -2 e 4
d) 1 e 2​

Answer 1

Explicação passo-a-passo:

x² +2x -8 =0

∆= 2² - 4.1.(-8)

∆= 4 + 32

∆= 36

x= - 2 ±√36/2.1

x= - 2 ±6/2

x1= -2+6/2

x1= 4/2

x1=2

x2= -2-6/2

x2= -8/2

x2= -4

S={ 2, -4}