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A-LevelMathematicsLogarithmic and exponential functionsOct/Nov 2018Paper 2 Q25 Marks

Given that 9x + 3x = 240, find the value of 3x and hence, using logarithms, find the value of x correct to 4 significant figures.

Q: What topic does this question test?

This question tests Logarithmic and exponential functions in A-Level Mathematics (syllabus code 9709). It is worth 5 marks.

📋 Examiner Report & Trap Analysis

Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...

🎯 Mark Scheme Breakdown

Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.

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About This A-Level Mathematics Question

Topic

This structured question tests Logarithmic and exponential functions in A-Level Mathematics (syllabus code 9709). It is worth 5 marks.

Source

This question appeared in the Cambridge A-Level Mathematics Oct/Nov 2018 examination, Paper 2 Variant 2.

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