i know that you get 4n times something but i dont know how
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When you factor out 4n, then just divide each term by 4n
4n³ − 16n² + 8n
= 4n (4n³/(4n) − 16n²/(4n) + 8n/(4n))
= 4n (n² − 4n + 2)
4n³ − 16n² + 8n
= 4n (4n³/(4n) − 16n²/(4n) + 8n/(4n))
= 4n (n² − 4n + 2)
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4 n (2 - 4 n + n^2)