Ответ:
2.a)√x=2-x
x=4-4x-x²=0
x-4+4x-x²=0
-x(x-1)+4(x-1)=0
(x-1)(x-4)=0
x-1=0
x-4=0
x=1
x=4
√1=2-1
√4=2-4
1=1
2=-2
x≠4
2.б)x²-3x-1=-3/x
(x²-3x-1)x=-3
(x²-3x-1)x+3=0
x³-3x²-x+3=0
x²(x-3)-(x-3)=0
(x-3)(x²-1)=0
x-3=0
x²-1=0
x1=-1
x2=1
x3=3
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Answers & Comments
Ответ:
2.a)√x=2-x
x=4-4x-x²=0
x-4+4x-x²=0
-x(x-1)+4(x-1)=0
(x-1)(x-4)=0
x-1=0
x-4=0
x=1
x=4
√1=2-1
√4=2-4
1=1
2=-2
x=1
x≠4
2.б)x²-3x-1=-3/x
(x²-3x-1)x=-3
(x²-3x-1)x+3=0
x³-3x²-x+3=0
x²(x-3)-(x-3)=0
(x-3)(x²-1)=0
x-3=0
x²-1=0
x1=-1
x2=1
x3=3