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qwertyboy2018
@qwertyboy2018
July 2022
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решите неравенство x^-2x-15<0 (^-это квадрат)
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pentV
X²-2x-15=0
x²-2x-3x+3x-15=0
x(x-5)+3(x-5)=0
(x-5)(x+3)=0
x=5 x=-3
Т.к. а(коэффициент при х²)>0 то парабола ветвями вверх и значит
х∈(-3;5)
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Answers & Comments
x²-2x-3x+3x-15=0
x(x-5)+3(x-5)=0
(x-5)(x+3)=0
x=5 x=-3
Т.к. а(коэффициент при х²)>0 то парабола ветвями вверх и значит
х∈(-3;5)