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NatashaFCSM
@NatashaFCSM
July 2022
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помогите!!!!
решить уравнение! x^2+6x-7=0
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vnezapno
X^2+6x-7=0
D=36+4*7=36+28=64>0
По теореме Виета:
х1+х2=-6 х1=1
х1*х2=-7 х2=-7
Ответ: -7;1
17 votes
Thanks 31
fildan59
D=6²-4*(-7)=64;
=8
x₁=(-6-8)/2=-7
x₂=(-6+8)/2=1
7 votes
Thanks 6
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Answers & Comments
D=36+4*7=36+28=64>0
По теореме Виета:
х1+х2=-6 х1=1
х1*х2=-7 х2=-7
Ответ: -7;1
x₁=(-6-8)/2=-7
x₂=(-6+8)/2=1