Пусть x2= t
t2-20t+64=0
D= 400 - 256
D= 144
t = 16
t= 4
x2=16
x= +4
x=-4
x2=4
x=2
x=-2
ответ: 2, -2,4,-4
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Пусть x2= t
t2-20t+64=0
D= 400 - 256
D= 144
t = 16
t= 4
x2=16
x= +4
x=-4
x2=4
x=2
x=-2
ответ: 2, -2,4,-4