Jika a³-a-1=0 maka a⁴+a³-a²-2a-9=
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Jika a³-a-1=0 maka a⁴+a³-a²-2a-9=
1 Jawaban
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1. Jawaban Anggress1
Jika,
a³-a-1 = 0
→ a³-a = 1
→ a(a²-1) = 1
Maka,
a⁴+a³-a²-2a - 9
= a(a³-a+a²-2) - 9
= a(1+a²-2) - 9
= a(a²-1) - 9
= 1 - 9
= -8