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substitute t = n^2

My teacher wants us to use either factoring or the quadratic formula on these problems.

Yes. first you have to change it to quadratic then you can factor

okay let me see...

kayyy

use this hint
\[\large 3n^4-4n^2+1=3n^4-3n^2-(n^2-1)=3n^2(n-1)-(n-1)(n+1)\]

thank y'all.