Rational targets from sums and differences

Rational targets from sums and differences

Secondary 2

4 marks

TGM Original Questions

Given \((2x+2y)^2=100\) and \(xy=-3.5\), find \(\frac{x^2+y^2}{8}\).[4]

Solution:

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Answer:\(\dfrac{x^2+y^2}{8}=\dfrac{32}{8}=4\)

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