Question

a conta pronta por favor x2-5x+4:0

Answer 1

x² - 5 x + 4 = 0
Δ = b² - 4.a.c
Δ = (-5)² - 4.1.4
Δ = 25 - 16
Δ = 9 ⇒ √9 = 3
x = - b + ou -3/2.1
x = -(5) +3/2
x´= 5 +3/2
x´= 8/2  ⇒ 4
x´´ = 5 - 3/2
x´´ = 2/2 ⇒ 1
S = {1 ; 4 }