X^2 + 10X - 24 = ( X - 2)*(X + 12 )
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D = 100 + 96 = 196 ; √ D = 14
X1 = ( - 10 + 14) : 2 = 2
X2 = ( - 24 ) : 2 = ( - 12 )
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3X^2 - 11X + 6 = ( X - 3 )*( X - 2/3)
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D = 121 - 72 = 49 ; √ D = 7
X1 = ( 11 + 7) : 6 = 3
X2 = 4 : 6 = 2/3
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