Moderate -0.5 This question requires applying the subtraction law of logarithms (ln a - ln b = ln(a/b)) to form a quadratic equation, then solving it. While it involves multiple steps (simplifying logs, cross-multiplying, solving quadratic, checking domain), each step is routine and the approach is standard for this topic type. Slightly easier than average due to straightforward algebraic manipulation.
Use law of the logarithm of a product or quotient and remove logarithms | M1 |
Obtain quadratic equation $x^2 - 5x + 5 = 0$, or equivalent | A1 |
Solve 3-term quadratic obtaining 1 or 2 roots | A1 |
Obtain answers 1.38 and 3.62 | A1 | [4]