Question 5
Indices and LogarithmsSolve (1/9)x+2 = 243x−2.
- A.7/6
- B.6/7
- C.−7/6
- D.−6/7
Show the answer and explanation
Answer: B (6/7)
Explanation
3^(−2x − 4) = 3^(5x − 10), so −2x − 4 = 5x − 10, 7x = 6 and x = 6/7.
Solve (1/9)x+2 = 243x−2.
Answer: B (6/7)
3^(−2x − 4) = 3^(5x − 10), so −2x − 4 = 5x − 10, 7x = 6 and x = 6/7.