0580/22 May/Jun 2021, Question 8: Substitution
Cambridge IGCSE Mathematics 0580 · Paper 22 (Extended) · Calculator · 2 marks
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The question, in short
Using the formula a = b²/(5c), work out the value of b given that a = 5.625 and c = 2.
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Solution · 2 marks
- 15.625 = b²/(5 × 2)
- 2b² = 5.625 × 10 = 56.25
- 3b = ±√56.25 = ±7.5
Answer7.5 or ±7.5
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