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vikaterminas
@vikaterminas
July 2022
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ПОМОГИТЕ СРОЧНО!!!
х²-4х-21≥0
х²+10х≥0
-2х²-6х+20≥0
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Answers & Comments
asyaklimenko21
1.
х²-4х-21=0
D=(-4)
²-4*1*(-21)=16+84=100
x12=(4+-10)/2=7; -3
Ответ:x=7,т.к. -3>0
2.
х²+10х=0
x(x+10)=0
x=0 или x+10=0
x=-10
Ответ:x=0,т.к. -10>0
3.
-2х²-6х+20=0
D=(-6)
²-4*(-2)*20=36+160=196
x12=(6+-14)/-4=-5;2
Ответ:x=2,т.к. -5>0
2 votes
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Answers & Comments
D=(-4)²-4*1*(-21)=16+84=100
x12=(4+-10)/2=7; -3
Ответ:x=7,т.к. -3>0
2.х²+10х=0
x(x+10)=0
x=0 или x+10=0
x=-10
Ответ:x=0,т.к. -10>0
3.-2х²-6х+20=0
D=(-6)²-4*(-2)*20=36+160=196
x12=(6+-14)/-4=-5;2
Ответ:x=2,т.к. -5>0