0580/23 Oct/Nov 2025, Question 9: Index Laws with Letters
Cambridge IGCSE Mathematics 0580 · Paper 23 (Extended) · Non-calculator · 1 mark
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The question, in short
Given n to the power 15 divided by n to the power x equals n to the power 5, find the value of x.
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Solution · 1 mark
- 1n¹⁵ ÷ nˣ = n¹⁵⁻ˣ, so 15 − x = 5
- 2x = 10
Answer10
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