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Using Algebraic Identities to Evaluate Numerical Expressions

Using Algebraic Identities to Evaluate Numerical Expressions

Secondary 2
  1. Factorise \({{x}^{2}}-2xy+{{y}^{2}}\).
  2. Hence, evaluate \(42\times 42-168+4\). You must show your working clearly.

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Answer:(a) \((x-y)^2\) (b) \(1600\)

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