IP2U3 Exercise 1 Q18

IP2U3 Exercise 1 Q18

Given that \({{\left( m+n \right)}^{2}}=2\) and \(\left( {{m}^{2}}+{{n}^{2}} \right)=15\), find the value of

  1. \(mn\),
  2. \({{\left( m-n \right)}^{2}}\).

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Answer:(a) \(mn=-6\frac{1}{2}\) (b) \(28\)

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