Question

Resolva as equações: x²-6x+8

Answer 1

x² - 6 x + 8 = 0
Δ = b² - 4.a.c
Δ = (-6)² - 4 1 8 
Δ = 36 - 32
Δ = 4 ⇒√4 = 2
x´= - b +ou - 2/2.a
x´= - (-6) + 2 / 2 .1
x´= 6 + 2 / 2
x´= 8/2
x´= 4
x´´ = 6 - 2/2
x´´ = 4/2
x´´ =2
S = { 2 ; 4 }