Jawab:

Penjelasan dengan langkah-langkah:

1. -4f - 7f = (-4 - 7)f = -11f

2. 33k + (-6k) = (33 - 6)k = 27k

3. 90h . 5j²k = (90 × 5) h j² k = 450hj²k

4. 25ab - 65bc + 40bc - 10ab = (25 - 10)ab - (65 - 40)bc = 15ab - 25bc

5. -5hi³ . 4j²k . (-2ij⁴) = (-5 × 4 × (-2)) h . (i^(3 + 1)) (j^(2 + 4)) k = 40hi⁴j⁶

6. 10ab⁴ . 64a³bc : 8a²b² =

10ab⁴ . (64/8) (a^(3-2)) (b^(1 - 2)) c =

10ab⁴ . 8a(b^(-1))c =

80 (a^(1+1)) (b^(4-1)) c =

80 a² b³ c

7. 25pq + 30pq = (25 + 30)pq = 55pq

8. 12r² - 75s² = (rV12 + sV75) (rV12 - sV75) = (2rV3 + 5sV3) (2rV3 - 5sV3)

V = akar kuadrat

9. 36m² - 144m + 144 = 36 (m² - 4m + 4) = 36 (m - 2)²

Jika 36m² - 144m + 144 = 0 atau 36 (m - 2)² = 0, maka m1 = m2 = 2

10. x² - x - 20 = (x - 5) (x + 4)

Jika x² - x - 20 = 0 atau (x - 5) (x + 4) = 0, maka x1 = 5 dan x2 = -4