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2x^2 -3x + 2 = 0
a = 2, b = -3, c = 2
x = ( -(-3) ±√[ (-3)^2 - 4(2) (2) ] ) / [2*2 ]
x = ( 3 ±√ [ 9 - 16 ] ) / 4
x = ( 3 ± i√ 7 ) / 4