x⁴-5x²+4=0

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x⁴-5x²+4=0x⁴-5x²+4=0x⁴-5x²+4=0x⁴-5x²+4=0(x²-1)(x

x⁴-5x²+4=0
x⁴-5x²+4=0

x⁴-5x²+4=0
x⁴-5x²+4=0
(x²-1)(x²-4)=0
(x+1)(x-1)(x+2)(x-2)=0
x1=-1 x2=1 x3=-2 x4=2

(x²-1)(x²-4)=0
(x+1)(x-1)(x+2)(x-2)=0
x1=-1
x2=1
x3=-2
x4=2

土1、土2