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dghxfbuhcy
@dghxfbuhcy
July 2022
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2х²-9х-10= 0. е) 5х²+12х+7=0
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Akula17
Verified answer
D=b² - 4ac = ( - 9 ) ^2 - 4 * 2 * ( - 10) = 81 +80=161
√D=√161
x1= 9 + √161 / 4
x2= 9 - √161 / 4
Ответ: 9 + √161 / 4 ; 9 - √161 / 4 .
D=b² - 4ac = 12² - 4 * 5*7=144 - 140=4
√D=2
x1= - 12 +2 / 10 = - 1
x2= - 12 - 2 / 10 = - 1,4
Ответ: - 1; - 1,4 .
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Answers & Comments
Verified answer
D=b² - 4ac = ( - 9 ) ^2 - 4 * 2 * ( - 10) = 81 +80=161√D=√161
x1= 9 + √161 / 4
x2= 9 - √161 / 4
Ответ: 9 + √161 / 4 ; 9 - √161 / 4 .
D=b² - 4ac = 12² - 4 * 5*7=144 - 140=4
√D=2
x1= - 12 +2 / 10 = - 1
x2= - 12 - 2 / 10 = - 1,4
Ответ: - 1; - 1,4 .