10z^2-15z-20/5

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Solution for 10z^2-15z-20/5 equation: 


z in (-oo:+oo)

10*z^2-(15*z)-(20/5) = 0

10*z^2-15*z-4 = 0

10*z^2-15*z-4 = 0

DELTA = (-15)^2-(-4*4*10)

DELTA = 385

DELTA > 0

z = (385^(1/2)+15)/(2*10) or z = (15-385^(1/2))/(2*10)

z = (385^(1/2)+15)/20 or z = (15-385^(1/2))/20

z in { (15-385^(1/2))/20, (385^(1/2)+15)/20 }

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