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m⁴-7m²+1 

=m⁴-9m²+2m²+1 
=m⁴+2m²+1-9m² 
=(m²)²+2.m².1+(1)²-(3m)² 
=(m²+1)²-(3m)² 
=(m²+1+3m) (m²+1-3m)
=(m²+3m+1) (m²-3m+1)
 Ans: (m²+3m+1) (m²-3m+1)
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