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Determine o valor de k para que a equação 4x^2 + kx + 2 = 0 tenha raízes reais e distintas.

I. k^2 > 32

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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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