Question

Resolvendo bháskara: 3x²- 15x + 12 = 0 , qual a resposta correta *
10 pontos
(A) S = {1, 3}
(B) S = {1, 4}
(C) S = {2, 4}
(D) S = {3, 4}
(E) S = {1, 2}​

Answer 1

3x²- 15x + 12 = 0. ==> :(3)

x² - 5x + 4 = 0

∆=25-16=9 => √∆=3

x= 5±3/2

x' =5+3/2 =8/2= 4 ✓

x"=5-3/2= 2/2= 1 ✓

==> B) S = {1, 4}