Question

resolva as equaçoes do 2º grau x²-x-6=0 ?

Answer 1

x²-x-6=0
A= 1 B=-1 C= -6

b²-4.a.c
Δ= (-1)²-4.1.(-6)
Δ= 1+24
Δ= 25
√25=5

1≈√5
  2.1

x1= 1+5= 6 = 3
               2

x2= 1-5= -4= -2
               2

S= { 3,-2 }