Question

resolva as equações do segundo grau:
a) x²+5x+6=0
b) x²- √3x=0
c) x²-121=0

Answer 1

a) ∆= 5²-4.1.6
∆= 25-24
∆= 1

x = -5±√1/2.1
x= -5±1/2
x1= -5+1/2= -4/2=-2
x2= -5-1/2=-6/2=-3

S={-2,-3}

b)x²-√3x=0
x(x-√3)=0
x1=0
x-√3=0
x2=+√3

S={0,√3}

c)x²-121=0

x²= 121
x=±√121
x=±11

S={+11,-11}