2025 IGCSE Additional Mathematics May/June 0606/13 Q1

2025 IGCSE Additional Mathematics May/June 0606/13 Q1

5 marks
  1. The diagram shows the graph of \(y=(2x+a)(x+b)(x+c)\) where \(a\), \(b\) and \(c\) are integers.
    Find values for \(a\), \(b\) and \(c\).[2]
  2. Use the graph to find the values of \(x\) for which \(y\ge2\).[3]

Solution:

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Answer:(a) \(a=1,\ b=2,\ c=-1\), or interchange \(b,c\). (b) Approximately \(-1.7\le x\le-1\) or \(x\ge1.2\).

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