X⁴+x² +25 factorise it
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=X^4+5X^2-5X^2+25
=-X^2(-X^2-5)-5(-X^2-5)
=-(X^2-5) (X^2-5)
=-X^2(-X^2-5)-5(-X^2-5)
=-(X^2-5) (X^2-5)
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