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Нэтэли1704
@Нэтэли1704
August 2022
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31-3х-х²=20х+7(х-2)²решите пожалуйста
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noki0633
31-3х-х²=20+7(х²-4х+4)
31-3х-х²=20+7х²-28х+28
31-3х-х²-20-7х²+28х-28=0
-8х²+25х+3=0|•(-1)
8х²-25х-3=0
Д=25²-4•8•3=625-96=529
х1=(-25-23)/(2•8)=-48/16=-3
х2=(-25+23)/(2•8)=-2/16=-1/8
2 votes
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Нэтэли1704
в примере же 20х
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Answers & Comments
31-3х-х²=20+7х²-28х+28
31-3х-х²-20-7х²+28х-28=0
-8х²+25х+3=0|•(-1)
8х²-25х-3=0
Д=25²-4•8•3=625-96=529
х1=(-25-23)/(2•8)=-48/16=-3
х2=(-25+23)/(2•8)=-2/16=-1/8