Question

a.
{x ∈ R | -1 < x < -2}

b.
{x ∈ R | -1 < x < 2}

c.
{x ∈ R | 1 < x < 2}

d.
{x ∈ R | 1 < x < -2}

e.
{x ∈ R | x < 2}

Answer 1

Resposta:-x²+3.x -2> 0

a= (-1)

b=3

c=(-2)   Δ=b²-4.a.c

            Δ=3²-4.(-1).(-2)

             Δ=9- 8

             Δ=1

x=-b±√Δ/2.a

x=-3±√1/2.(-1)

x=-3±1/-2

x1=-3 +1/-2=-2/-2=1

x2=-3-1/-2=-4/-2=2

{x∈ R/ 1 <x<2}

Explicação passo-a-passo: