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@1634746857
July 2022
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(х²+6х)² - 4(х²+6х+1)-17=0 решите уравнение
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acar
(x²+6x)²-4(x²+6x)-21=0
пусть x²+6x=t
t²-4t-21=0
d=100=10²
t1=7
t2=-3
x²+6x=7 x²+6x=-3
x²+6x-7=0 x²+6x+3=0
d=64=8² d=24=2√6
x1=1 x3=-3-√6
x2=-7 x4=-3+√6
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Answers & Comments
пусть x²+6x=t
t²-4t-21=0
d=100=10²
t1=7
t2=-3
x²+6x=7 x²+6x=-3
x²+6x-7=0 x²+6x+3=0
d=64=8² d=24=2√6
x1=1 x3=-3-√6
x2=-7 x4=-3+√6