Question
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Hitunglah nilai polinomial \( f(x)=x^{3}-4 x^{2}+5 x+ \) 10 saat \( x=-3 \). A. -38 B. -48 C. -58 D. -68 E. -78

Ask by Tyler Phillips. in Indonesia
Feb 25,2025

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Tutor-Verified Answer

Answer

\( f(-3) = -68 \), jadi jawaban yang benar adalah D. -68.

Solution

Untuk menemukan nilai polinomial \( f(x) = x^{3} - 4x^{2} + 5x + 10 \) saat \( x = -3 \), kita dapat menggantikan nilai \( x \) ke dalam polinomial dan kemudian menghitung hasilnya. Dengan menggantikan \( x = -3 \) ke dalam polinomial \( f(x) \), kita dapatkan: \[ f(-3) = (-3)^{3} - 4(-3)^{2} + 5(-3) + 10 \] Sekarang, kita akan menghitung nilai \( f(-3) \) secara langkah demi langkah: 1. Hitung \( (-3)^{3} \): \[ (-3)^{3} = -27 \] 2. Hitung \( 4(-3)^{2} \): \[ 4(-3)^{2} = 4(9) = 36 \] 3. Hitung \( 5(-3) \): \[ 5(-3) = -15 \] 4. Hitung \( f(-3) \) dengan menggabungkan hasil dari langkah-langkah di atas: \[ f(-3) = -27 - 36 - 15 + 10 = -68 \] Jadi, nilai polinomial \( f(x) = x^{3} - 4x^{2} + 5x + 10 \) saat \( x = -3 \) adalah -68. Jadi, jawaban yang benar adalah D. -68.

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Bonus Knowledge

Mari kita hitung nilai polinomial \( f(x) = x^{3}-4x^{2}+5x+10 \) saat \( x = -3 \). Pertama, kita substitusi \( x \) dengan \(-3\): \[ f(-3) = (-3)^{3} - 4(-3)^{2} + 5(-3) + 10 \] Sekarang kita hitung setiap bagian: 1. \( (-3)^{3} = -27 \) 2. \( -4(-3)^{2} = -4(9) = -36 \) 3. \( 5(-3) = -15 \) 4. \( +10 \) tetap \( +10 \) Kemudian kita jumlahkan semua hasil: \[ f(-3) = -27 - 36 - 15 + 10 \] Kolomkan hasilnya: \[ f(-3) = -27 - 36 = -63 \] \[ -63 - 15 = -78 \] \[ -78 + 10 = -68 \] Jadi, nilai dari \( f(-3) \) adalah \( -68 \). Jawaban yang benar adalah: D. -68

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