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a^4 + a^3 - a^2 - 2a + 9
= a(a^3 + a^2 - a - 2) +9
= a{(a^3 - a - 1)+ a^2 - 1} +9
= a(0 + a^2 - 1) +9
= a^3 - a + 9
= (a^3 - a - 1) +10
= 0 + 10
= 10
jadi, intinya, jadiin persamaannya harus ada a^3-a-1 nya biar bisa disubsitusikan dengan nilai 0