(c) Va (5) Find the truth values of the following statements. Then construct their negations (a) There exists an integer x such that (x²-x-1)(x + 1) = 0. (b) For all real numbers x and y, x² + y³ ≥ 0. (c) There exist distinct integers x and y such that x² = y³. (d) There exist distinct integers x and y such that x = y³.

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