25 Soal PTS Matematika Kelas 9 SMP Semester 1 Kurikulum Merdeka, Ada Kunci Jawaban dan Pembahasan

2. y = 2(4) + 3 = 8 + 3 = 11

3. Akar kuadrat 144 = 12, akar kuadrat 81 = 9, jadi 12 + 9 = 21

4. x^2 - 16 = (x - 4)(x + 4)

5. 4a + 3a - 7a = (4 + 3 -7)a = 0

6. x^2 - 5x + 6 = 0
   Faktorkan: (x - 2)(x - 3) = 0
   Jadi, x = 2 atau 3

7. f(2) = 2(2)^2 - 3(2) + 1 = 2(4) - 6 + 1 = 8 - 6 + 1 = 3

8. Luas = 1/2 × 10 × 12 = 60 cm⊃2;

9. Keliling = 2 × π × 7 = 2 × 22/7 × 7 = 44 cm

10. Volume = 8 × 5 × 3 = 120 cm⊃3;

11. cos 60° = 0,5 (karena sin 30° = cos 60°)

12. Dari x - y = 2 → y = x - 2
    Substitusi ke 2x + y = 10 → 2x + (x - 2) = 10 → 3x = 12 → x = 4
    y = 4 - 2 = 2

13. 3x - 4 < 8>

14. log\_2 16 = 4 (karena 2^4 = 16)

15. 3/a = 9/12 → 3 × 12 = 9a → 36 = 9a → a = 4

16. (2x - 3)(x + 4) = 2x^2 + 8x - 3x - 12 = 2x^2 + 5x - 12
    Jika x = 2 → 2(4) + 5(2) - 12 = 8 + 10 - 12 = 6