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smokeonwater
@smokeonwater
July 2022
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решить квадратное уравнение 1)-x^2-2x+15=0 2)18-x^2=14
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ПетрушкинВ
1) x^2-2x+15=0
D=4+4*15=4+60=64
x1=(2+8)/(-2)=10/(-2)=-5
x2=(2-8)/(-2)=(-6)/(-2)=3
2) 18-x^2=14
-x^2=14-18
-x^2=-4
x^2=4
x=
±2
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smokeonwater
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Answers & Comments
D=4+4*15=4+60=64
x1=(2+8)/(-2)=10/(-2)=-5
x2=(2-8)/(-2)=(-6)/(-2)=3
2) 18-x^2=14
-x^2=14-18
-x^2=-4
x^2=4
x=±2