Resposta :
Oie, Tudo bom?
Resposta: c) 12.
[tex]1x {}^{2} - 4x + 1 = 0 \\ x {}^{2} - 4x + 1 = 0[/tex]
[tex]\boxed{a = 1 \: ,\: b = - 4 \: ,\: c = 1}[/tex]
[tex]∆ = b {}^{2} - 4ac \\ ∆ = ( - 4) {}^{2} - 4 \: . \: 1 \: . \: 1 \\ ∆ = 16 - 4 \\ \boxed{∆ = 12}[/tex]
Att. NLE Top Shotta