Kalikan (x + 2)(x² – 3x + 5).

Soal

Kalikan (x + 2)(x² – 3x + 5).

• A. x³ – x² – x + 10
• B. x³ – x² – x – 10
• C. x³ – x² + x + 10
• D. x³ – 3x² – x + 10

Jawaban

A. x³ – x² – x + 10

Pembahasan

x·x² = x³; x·(-3x) = -3x²; x·5 = 5x; 2·x² = 2x²; 2·(-3x) = -6x; 2·5 = 10; gabungkan: x³, -3x²+2x² = -x², 5x-6x = -x, +10.