Eric Nicholas K's answer to Shan Kuek's Secondary 3 A Maths Singapore question.

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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
1st
Here is the approach. Note that for ‘show that...’ questions, we are not allowed to write the phrases ‘< 0’, ‘> 0’ or ‘= 0’; we must work our way to one of those.