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Verified answer
Gunakan segitiga pascal1
1 2 1
1 3 3 1
karena pangkat 3 maka ambil baris ke 3 (1 3 3 1)
pangkatnya tinggal diurutkan pangkat 3 pangkat 2 pangkat 0
= k³ + 3k²(1) + 3(k)1² + 1³
= k³ + 3k² + 3k + 1