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X⁴ = 5 X²
X⁴ - 5X2= 0
X² (x² -5)=0
X² = 0
X²-5=0
X= √5
X= -√5
X= 0
x⁴= 5x²
x⁴-5x²=0
(x².(x²-5)=0
x²=0
x²-5=0
x=0
x=√5
x= -√5
x1= -√5
x2= 0
x3= √5