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danapatoka
@danapatoka
July 2022
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(x^2-5)^2-3(x^2-5)-4=0
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Liano4ka94
(x²-5)²-3(x²-5)-4=0
(x²-5)(x²-5-3)-4=0
(x²-5)(x²-8)-4=0
x⁴-8x²-5x²+40-4=0
x⁴-13x²+36=0
Пусть x²=a, тогда
a²-13a+36=0
D=(-13)²-4*1-36=169-144=25
a₁=(13+5)/2=9
a₂=(13-5)/2=4
x²=9 x²=4
x=3 x=-3 x=2 x=-2
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danapatoka
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Answers & Comments
(x²-5)(x²-5-3)-4=0
(x²-5)(x²-8)-4=0
x⁴-8x²-5x²+40-4=0
x⁴-13x²+36=0
Пусть x²=a, тогда
a²-13a+36=0
D=(-13)²-4*1-36=169-144=25
a₁=(13+5)/2=9
a₂=(13-5)/2=4
x²=9 x²=4
x=3 x=-3 x=2 x=-2