1) x2 - 6x + 9 = 0 a) impossibile b) x 1 = x 2 = 3 c) x1 = 0 e x2 = 3 2) 2x2 - 4x + 3 = 0  a) impossibile b) x1 = 0 e x2 = -2 c) x1 = 2 - √5 e x2 = 2 + √5 3) -x2 - x = 0 a) x1 = 0 e x2 = +1 b) x1 = 0 e x2 = -1 c) x1 = x2 = 0 4) x2 - 7x +12 = 0 a) x1 = -3 e x2 = -4 b) impossibile c) x1 = +3 e x2 = +4 5) (x - 2)2 = 9 a) x1 = 5 e x2 = 1 b) impossibile c) x1 = -1 e x2 = 5 6) -x2 + 16 = 0 a) x1 = -4 e x2 = +4 b) impossibile c) x1 = x2 = 4 7) - x2 - 10x - 25 = 0 a) impossibile b) x1 = x2 = -5 c) x1 = x2 = +5 8) 4x2 - 12x + 9 = 0 a) x1 = x2 = 3/2 b) x1 = 0 e x2 = -9 c) impossibile 9) - x2 - 12 = 0 a) x1 = -2√3 e x2 = +2√3 b) x1 = 0 e x2 = 6 c) impossibile 10) x2 + 6 x + 5 = 0 a) impossibile b) x1 = 5 e x2 = 1 c) x1 = -1 e x2 = -5 11) - 5x2 = 0 a) impossibile b) x1 = x2 = 0  c) x1, 2 = ∓ 1/5

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