Ответ:
Объяснение:
(x+5)²=t, t≥0
t²-6t-7=0
D=36+28= 64
t1= (6-8)/2= -1 - не корень
t2= (6+8)/2= 7
(x+5)²=7
x²+10x+18=0
D=100-72= 28
x1= (-10-2√7)/2= -5-√7
x2= (-10+2√7)/2= -5+√7
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Ответ:
Объяснение:
(x+5)²=t, t≥0
t²-6t-7=0
D=36+28= 64
t1= (6-8)/2= -1 - не корень
t2= (6+8)/2= 7
(x+5)²=7
x²+10x+18=0
D=100-72= 28
x1= (-10-2√7)/2= -5-√7
x2= (-10+2√7)/2= -5+√7