=-n²+4n+4n-16=-n(n-4)+4(n-4)=(n-4)(4-n)
II sposób:
-n²+8n-16=-(n²-8n+16)=-(n-4)²
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=-n²+4n+4n-16=-n(n-4)+4(n-4)=(n-4)(4-n)
II sposób:
-n²+8n-16=-(n²-8n+16)=-(n-4)²