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Hauser228
@Hauser228
July 2022
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Решить биквадратное уравнение x в 4-20x в 2+64=0
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пимочка
x^4 - 20x^2 + 64 = 0
x
²=t
t
²-20t+64=0
D=b
²-4ac=20²-4*1*64=400-256=144
t1=-b-
√D / 2a = 20-12/2=8/2=4
t2=-b+
√D/2a=20+12/2=32/2=16
x²=4 x²=16
x1=2 x3=4
x2=-2 x4=-4
Ответ: х1=-2, х2=2, х3=-4, х4=4
14 votes
Thanks 34
alidarovartur
-20^2
alidarovartur
а не 20^2
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Answers & Comments
x²=t
t²-20t+64=0
D=b²-4ac=20²-4*1*64=400-256=144
t1=-b-√D / 2a = 20-12/2=8/2=4
t2=-b+√D/2a=20+12/2=32/2=16
x²=4 x²=16
x1=2 x3=4
x2=-2 x4=-4
Ответ: х1=-2, х2=2, х3=-4, х4=4