13z²+26z-(z+2)=0
13z²+25z-2=0
D = b²-4ac = 25²-4*13*(-2) = 729 = 27²
x1 = (-25-27)/(2*13) = -2
x2 = (-25+27)/(2*13) = 1/13
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13z²+26z-(z+2)=0
13z²+25z-2=0
D = b²-4ac = 25²-4*13*(-2) = 729 = 27²
x1 = (-25-27)/(2*13) = -2
x2 = (-25+27)/(2*13) = 1/13