Ответ:
z²-25=z-5
z²-25-z+5=0
z²-20-z=0
z²-z-20=0
z2+4z-5z-20=0
z×(z+4)-5(z+4)=0
(z+4)×(z-5)=0
z+4=0
z-5=0
z1=-4;z2=5
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Ответ:
z²-25=z-5
z²-25-z+5=0
z²-20-z=0
z²-z-20=0
z2+4z-5z-20=0
z×(z+4)-5(z+4)=0
(z+4)×(z-5)=0
z+4=0
z-5=0
z1=-4;z2=5