Question

pertencem ao conjunto...

Answer 1

x • ( x - 6 ) / 2 > 8

x2 - 6x > 2• 8

x2 - 6x > 16

x2 - 6x - 16 > 0

x2 - 6x - 16 = 0

∆ = 36 + 64

∆ = 100

X1 = ( 6 +√100 ) / 2

X1 = ( 6 + 10 ) / 2

X1= 16 / 2

X1 = 8

X2 = ( 6 - 10 ) / 2

X2 = - 4 / 2

X2 = - 2

+++++ - 2 --------------- 8 ++++

x < - 2 ou x > 8

] - 2 , 8 [

opção B