4024/11 Oct/Nov 2022, Question 18: Proportion to Powers of x
Cambridge O Level Mathematics 4024 · Paper 11 (Non-calculator) · Non-calculator · 2 marks
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The question, in short
Given that b varies as the square of a, and b = 18 when a = 3, work out the value of b at a = 5.
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Solution · 2 marks
- 1b = ka² → 18 = k × 3² → k = 2
- 2b = 2 × 5² = 50
Answer50
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