Question

resolva as equações do 2 grau usando a formula geral-x2+×+12=0

Answer 1

a)
x² +6x +9=0
Δ=b²-4ac
Δ=36-36
Δ=0
x'=x"=- \frac{6}{2} =-3

S={-3}

b)
x² +x+12=0
Δ=1-48
Δ=-47
√Δ=√-47
S= { }

c)
7x²+x+1=0
Δ=1-28
Δ=-27

S-{ }


d)

x²-x-1=0
Δ=1+4
Δ=5
√Δ=±√5

x'= \frac{1+ \sqrt{5} }{2}

x"= \frac{1- \sqrt{5} }{2}

Answer 2

Seria -x ao quadrado + x + 12 = 0 ?