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(a-5)⁴ = 1. (a)⁴ (-5)° + 4. (a)³ (-5)¹ + 6. (a)² (-5)² + 4. (a)¹ (-5)³ +1 (a)° (-5)⁴
= 1. a⁴. 1 + 4. a³. -5 +6. a². 25+ 4. a. -125 + 1. 1. 625
= a⁴-20a³+150a²-500a+625
Maaf ya kalau salah ^^
a pangkat 4 + 20a +5 pangkat 4
a pangkat 4 + 20a + 625