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oleny
@oleny
July 2022
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sasharay028
#1
а)х2+х-12=0
D=b2-4ac
D=(1)2-4×1×(-12)=1+48=49 D=7
x1=-1+7/2=3
x2=-1-7/2=-4
б)9х2+12+4=0
D=(12)2-4×9×4=144-108=36 D=6
x1=-12+6/18=0,33
x2=-12-6/18 =-1
в)х2+6х+10=0
D=36-40=-4
нет решений
г)-3х2+5+2=0
D=25+24=49 D=7
x1=-5+7/-6=-0,33
x2=-5-7/-6=6
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Answers & Comments
а)х2+х-12=0
D=b2-4ac
D=(1)2-4×1×(-12)=1+48=49 D=7
x1=-1+7/2=3
x2=-1-7/2=-4
б)9х2+12+4=0
D=(12)2-4×9×4=144-108=36 D=6
x1=-12+6/18=0,33
x2=-12-6/18 =-1
в)х2+6х+10=0
D=36-40=-4
нет решений
г)-3х2+5+2=0
D=25+24=49 D=7
x1=-5+7/-6=-0,33
x2=-5-7/-6=6