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Объяснение:
x²-2x=t
t²-11t+24=0
D=121-96=25
t1= (11-5)/2= 3
t2= (11+5)/2= 8
1) x²-2x-3=0
D= 4+12=16
x1= (2-4)/2= -1
x2= (2+4)/2= 3
2) x²-2x-8=0
D=4+32= 36
x3= (2-6)/2= -2
x4= (2+6)/2= 4