Sederhanakan: (x – 3)(x + 3) – (x – 1)(x + 1).
Soal
Sederhanakan: (x – 3)(x + 3) – (x – 1)(x + 1).
- A. -8
- B. 8
- C. –2x² + 8
- D. –2x² – 8
Jawaban
A. -8
Pembahasan
(x² – 9) – (x² – 1) = x² – 9 – x² + 1 = –8.
Sederhanakan: (x – 3)(x + 3) – (x – 1)(x + 1).
A. -8
(x² – 9) – (x² – 1) = x² – 9 – x² + 1 = –8.