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