4X^2 - X^2 - 4X - 6X + 1 - 9 = 0 3X^2 - 10X - 8 = 0 D = 100 -4*3*(-8) = 100 + 96 = 196 V D = 14 X1 = ( 10 + 14 ) : 6 = 24 : 6 = 4 X2 = ( - 4\6 ) = ( - 2\3 )