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a pangkat 4 , 3 pangkat 4
a + 81= 81
(a+3)² × (a+3)²
(a²+6a+9) × (a²+6a+9)
= a⁴ +6a³ +9a²+ 6a³ +36a² +54a + 9a²+ 54a+ 81
= a⁴+12a²+54a²+108a+81