Question 7
IndicesSolve 52(x−1) × 5x+1 = 0.04.
- A.1/3
- B.1/4
- C.−1/5
- D.−1/3
Show the answer and explanation
Answer: D (−1/3)
Explanation
0.04 = 1/25 = 5−2. Adding the powers: 2x − 2 + x + 1 = −2, so 3x = −1 and x = −1/3.
Solve 52(x−1) × 5x+1 = 0.04.
Answer: D (−1/3)
0.04 = 1/25 = 5−2. Adding the powers: 2x − 2 + x + 1 = −2, so 3x = −1 and x = −1/3.