Question

Quanto é: x ao quadrado + 2x + 2x +4

Answer 1

x² + 2x + 2x + 4 = x² + 4x + 4 

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10/04/2016
Sepauto - SSRC
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Answer 2

x² + 2x  + 2x + 4
x² + 4x + 4 = 0

Calculando as raízes:

Δ = (4)² - 4(1)(4)
Δ = 16 - 16  =0
√Δ = 0

x1 = (-4 + 0)/2 = -2
x1 = (-4 - 0)/2 = -2

S={ x ∈|R / x = -2}

Espero ter ajudado.