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2x^2 + 3x - 9 = 0
(2x-3)(x+3) = 0
2x - 3 = 0 I x + 3 = 0
x = 3/2 l x = -3
2)
x^2 + x - 20 = 0
(x-5)(x+4) = 0
x - 5 = 0 I x + 4 = 0
x = 5 l x = -4