3(n-1)²-2(n-1)+1怎么化简

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3(n-1)²-2(n-1)+1怎么化简
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3(n-1)²-2(n-1)+1怎么化简
3(n-1)²-2(n-1)+1怎么化简

3(n-1)²-2(n-1)+1怎么化简
3(n-1)²-2(n-1)+1
=3(n²-2n+1)-2(n-1)+1
=3n²-6n+3-2n+2+1
=3n²-8n+6