75 - 35z = 10z²
10z² +35z-75 = 0
D =1225 +40*75 = 1225+3000 = 4225=65²
z(1) = (-35-65)/20 = -5
z(2) = (-35+65)/20 = 1.5
ИЛИ
10z²+50z - 15z-75=0
10z(z+5) - 15(z+5) = 0
(z+5)(10z-15) = 0
z+5 = 0 или 10z-15 = 0
z(1) = -5 10z=15
z(2) = 1.5
75 - 35z = 10z²
10z² +35z-75 = 0
D =1225 +40*75 = 1225+3000 = 4225=65²
z(1) = (-35-65)/20 = -5
z(2) = (-35+65)/20 = 1.5
ИЛИ
10z² +35z-75 = 0
10z²+50z - 15z-75=0
10z(z+5) - 15(z+5) = 0
(z+5)(10z-15) = 0
z+5 = 0 или 10z-15 = 0
z(1) = -5 10z=15
z(2) = 1.5