1) x2 - 25 =0 a) x1 = x2 = +5 b) x1 = x2 = -5 c) x1 = 5 e x2 = -5 2) 3x2 =0 a) x1 = x2 = 0 b) x1 = 0 e x2 = -3 c) impossibile 3) x2 - 5x =0 a) x1 = -5 e x2 = +5 b) impossibile c) x1 = 0 e x2 = +5 4) x2 + 4 = 0 a) x1 = -2 e x2 = +2 b) impossibile c) x1 = x2 = 2 5) x2 - 9 =0 a) x1 = -3 e x2 = +3 b) impossibile c) x1 = x2 = 3 6) 25 x2 = 0 a) x1 = x2 = 5 b) x1 = x2 = -5 c) x1 = x2 = 0 7) x2 + 3x = 0 a) x1 = x2 = -3 b) x1 = 0 e x2 = -3 c) x1 = 0 e x2 = +3 8) 3 x2 + 5 = 0 a) x1 = 3 e x2 = -5 b) impossibile c) x1 = x2 = 5/3 9) 2x2 - 4x = 0 a) impossibile b) x1 = x2 = 2 c) x1 = 0 e x2 = 2 10) x2 + 1 = 0 a) impossibile b) x1 = x2 = 1 c) x1 = 0 e x2 = -1

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