4024/13 May/Jun 2026, Question 18: Rearranging Complex Formulas
Cambridge O Level Mathematics 4024 · Paper 13 (Non-calculator) · Non-calculator · 4 marks
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The question, in short
Rearrange a = (x + 4)/(7 − x) to make x the subject.
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Solution · 4 marks
- 1a(7 − x) = x + 4
- 27a − ax = x + 4
- 37a − 4 = x + ax
- 47a − 4 = x(1 + a)
- 5x = (7a − 4)/(a + 1)
Answerx = (7a − 4)/(a + 1)
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Also searched as: 4024/13/M/J/26 · 4024_s26_qp_13 · 4024 s26 13 · question 18.
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