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2020 SJI P1 Q1
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2020 SJI P1 Q1
IB Year 5 | Grade 11
5 marks
Solve the inequality \(x^2+x-20\geq0\).
[2]
Hence, by means of a suitable substitution, solve the inequality \(x^2+|x|-20\geq0\).
[3]
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(a) \(x\leq-5\) or \(x\geq4\) (b) \(x\leq-4\) or \(x\geq4\)
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