Symmetric reciprocal relations

Symmetric reciprocal relations

Secondary 2

4 marks

TGM Original Questions

Core stretch

Given \((a+b)^2=7\) and \(\dfrac ab+\dfrac ba=3\), find

\(ab\), and[2]
\((2b-2a)^2\).[2]

Solution:

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Answer:(i) \(ab=\dfrac75\) (ii) \(\dfrac{28}{5}\).

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