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x² = -2, então x = ±i√2

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A solução exata não pode ser expressa em termos de funções elementares.

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x = -1 (tripla raiz).

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A equação não possui soluções reais.

","solution_explanation","statement","

Resolva a equação x⁴ + 4x² + 4 = 0.

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57. (UFRGS-RS) Na promoção de um produto cujo custo unitário é de R$ 5,75 se lê: \"Leve 3, pague 2\". Usando as condições da promoção, a economia máxima que poderá ser feita na compra de 188 itens deste produto é:

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