Question 38
Number BasesGiven that 124x = 7(14x), find the value of x.
- A.12
- B.11
- C.9
- D.8
Show the answer and explanation
Answer: D (8)
Explanation
x2 + 2x + 4 = 7(x + 4), so x2 − 5x − 24 = 0 and (x − 8)(x + 3) = 0. The base must be positive: x = 8.
Given that 124x = 7(14x), find the value of x.
Answer: D (8)
x2 + 2x + 4 = 7(x + 4), so x2 − 5x − 24 = 0 and (x − 8)(x + 3) = 0. The base must be positive: x = 8.