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aibraeva02
@aibraeva02
July 2022
2
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решите неравенство 7х^4-48х^2-7=0
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Mihail001192
Verified answer
1) 7x² + 1 = 0
7x² = - 1
x² = - 1 / 7
Не имеет действительных корней (∅)
2) х² - 7 = 0
х² = 7
х = - √7
х = √7
ОТВЕТ: - √7 ; √7
0 votes
Thanks 0
армения20171
7x⁴-48x²-7=0
x²=t>0
7t²-48t-7=0
D/4=576+49=625=25²
t=(24±25)/7
t1=7;t2=-1/7
1)x²=7;x=±√7
2)x²=-1/7;x€∅
ответ х=±√7
2 votes
Thanks 1
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Answers & Comments
Verified answer
1) 7x² + 1 = 0
7x² = - 1
x² = - 1 / 7
Не имеет действительных корней (∅)
2) х² - 7 = 0
х² = 7
х = - √7
х = √7
ОТВЕТ: - √7 ; √7
x²=t>0
7t²-48t-7=0
D/4=576+49=625=25²
t=(24±25)/7
t1=7;t2=-1/7
1)x²=7;x=±√7
2)x²=-1/7;x€∅
ответ х=±√7