Jeremy Sim's answer to Megan's Junior College 1 H2 Maths Singapore question.
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For (iii), observe that the centre of the circle is directly above the turning point of your previous graph. Therefore it is clear that once the radius of the circle hits 3 or more, the two graphs will start to intersect and therefore real solutions start to exist.
Date Posted:
4 years ago
Just to add on, the arrow pointing to the right is not required working. Your GC can find turning points straightaway so do not waste valuable time doing the differentiation in an exam. I did that because I have no GC haha.
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