Test Index

JAMB Mathematics 2015 Paper

© africaexams.com

Question : 40

Total: 61

Evaluate log₇17

1.35
1.353
1.455
0.455

Solution:

Concept:

Use the change of base formula for logarithms.

Explanation:

Write

\log_7 17

in terms of common logarithms.

\log_7 17 = \frac{\log_{10} 17}{\log_{10} 7}

Substitute the known values.

\log_{10} 17 \approx 1.2304

\log_{10} 7 \approx 0.8451

Divide the two values.

\frac{1.2304}{0.8451} \approx 1.4559

Thus,

\log_7 17 \approx 1.455

.

Answer:

C.

1.455

© africaexams.com

Go to Question:

Prev Question

Next Question