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kbkbz13
@kbkbz13
July 2022
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решите пожалуйста уравнение (6х+5) во 2 степени- 4х(3+9х)=49
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ZoyaBogomolova
(6x+5)^2 - 4x(3+9x) = 49
36x^2+60x+25-12x+36x^2=49
72x^2+48x-24=0 :24
3x^2+2x-1=0
D=4+12=16
x1=-2+4/6=1/3
x2=-2-4/6=-1
Ответ: 1/3 и -1
1 votes
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kbkbz13
спасибо большое!)
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Answers & Comments
36x^2+60x+25-12x+36x^2=49
72x^2+48x-24=0 :24
3x^2+2x-1=0
D=4+12=16
x1=-2+4/6=1/3
x2=-2-4/6=-1
Ответ: 1/3 и -1