x² - 2x - 3 = 0
D = b² - 4ac = 4 + 12 = 16
X1 , X2 = ( - b ± √D )/2 = ( 2 ± √16 ) / 2
X1 = ( 2 + 4 ) / 2 = 6 / 2 = 3
X2 = ( 2 - 4 ) / 2 = ( - 2 ) / 2 = ( - 1 )
X1 = 3 , X2 = ( -1 )
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x² - 2x - 3 = 0
D = b² - 4ac = 4 + 12 = 16
X1 , X2 = ( - b ± √D )/2 = ( 2 ± √16 ) / 2
X1 = ( 2 + 4 ) / 2 = 6 / 2 = 3
X2 = ( 2 - 4 ) / 2 = ( - 2 ) / 2 = ( - 1 )
X1 = 3 , X2 = ( -1 )