Use truth sets to prove or disprove the following quantified statements. a) Let D = {-5, 3, 4} Let P(x) be the predicate "x - 6x - 13x + 42 < 0". Show that VED, T - 6x 13x + 42 < 0 b) Let D = {-5, 1, 1,3,4} Let P(x) be the predicate "x - 6x Show that VED, x - 6x - 6x13x + 42 < 0".. - - 13x + 42 < 0 is false.