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Verified answer
f(x) = 8x³ + 42x² + ax – 5 habis dibagi 4x – 1.Maka bisa dengan horner
1)4x-1=0
X=1/4
2)1/4 | 8_42_a_____-5
___|___2__11____(a+11)/4
8_44__(a+11)_(a-9)/4
3) sisa=0
(a-9)/4=0
(a-9)=0
a=9
4)hasil bagi
8x^2+44x+(a+11)
8x^2+44x+(9+11)
8x^2+44x+20
Keterangan
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^:pangkat
/:per
Dibagian 2 menggunakan horner
Maaf jika ada yg salah semoga membantu