1 Г.
х^2-4x+5=0
(x-2)^2=0
x-2=0
x=2
2.B.
x^2+2x+1=1
x^2+2x=0(убрали слагаемые 1)
x(x+2)=0
x=0 и x+2=0
x=0 и х=-2
3. A
9-x^2=0
-x^2=-9
x1 = -3
x2 = 3
4.Д
x^2-4x+3=0
x^2-x-3x+3x=0
x(x-1)-3(x-1)=0
(x-1)(x-3)=0
x-1=0 и x-3=0
x1=1 x2=3
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Answers & Comments
1 Г.
х^2-4x+5=0
(x-2)^2=0
x-2=0
x=2
2.B.
x^2+2x+1=1
x^2+2x=0(убрали слагаемые 1)
x(x+2)=0
x=0 и x+2=0
x=0 и х=-2
3. A
9-x^2=0
-x^2=-9
x1 = -3
x2 = 3
4.Д
x^2-4x+3=0
x^2-x-3x+3x=0
x(x-1)-3(x-1)=0
(x-1)(x-3)=0
x-1=0 и x-3=0
x1=1 x2=3