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alibi0303
@alibi0303
July 2022
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помогите решить алгебру 13.13
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ОкиДоки911
1)x²+4=0
x²=-4 - решений нет
2)-(x²+6x+9)-2=0
-x²-6x-9-2=0
-x²-6x-11=0
x²+6x+11=0
D=b²-4ac=36-44=-8-решений нет
3)x²-4x+4-2=0
x²-4x+2=0
D=b²-4ac=16-8=8=2√2
x1=-b+√D/2a=4+2√2/2=3√2
x2=-b-√D/2a=4-2√2/2=√2
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Answers & Comments
x²=-4 - решений нет
2)-(x²+6x+9)-2=0
-x²-6x-9-2=0
-x²-6x-11=0
x²+6x+11=0
D=b²-4ac=36-44=-8-решений нет
3)x²-4x+4-2=0
x²-4x+2=0
D=b²-4ac=16-8=8=2√2
x1=-b+√D/2a=4+2√2/2=3√2
x2=-b-√D/2a=4-2√2/2=√2