Объяснение:
1. решений нет или же 0
2. D=b²-4ac=2²-4*1*(-3)=4+12=16=4²
x1=2-4/2=-1
x2=2+4/2=3
3.10x²-7x+1=0
D=b²-4ac=7²-4*10*1=49-40=9=3²
x1=7-9/20=-0,1
x2=7+9/20=4/5
Ответ:
1)
x = -
+x = 0
x(x+1) = 0
x = 0 или х+1 = 0
х = -1.
х = 0; 1
2.
-7x+1 = 0
10-2x-5x+1 = 0
2x(5x-1)-(5x-1) = 0
(5x-1)(2x-1) = 0
5x-1 = 0 2x-1 = 0
5x = 1 2x = 1
x = 1/5 x = 1/2
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Answers & Comments
Объяснение:
1. решений нет или же 0
2. D=b²-4ac=2²-4*1*(-3)=4+12=16=4²
x1=2-4/2=-1
x2=2+4/2=3
3.10x²-7x+1=0
D=b²-4ac=7²-4*10*1=49-40=9=3²
x1=7-9/20=-0,1
x2=7+9/20=4/5
Ответ:
1)
x = -
+x = 0
x(x+1) = 0
x = 0 или х+1 = 0
х = -1.
х = 0; 1
2.
-7x+1 = 0
10-2x-5x+1 = 0
2x(5x-1)-(5x-1) = 0
(5x-1)(2x-1) = 0
5x-1 = 0 2x-1 = 0
5x = 1 2x = 1
x = 1/5 x = 1/2