Simplification followed by decimal evaluation

Simplification followed by decimal evaluation

Secondary 2

3 marks

TGM Original Questions

Simplify \(p^2-(p+r)(p-r)\). Hence evaluate \(18.4^2-21.4\times15.4\).[3]

Solution:

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Answer:Simplified expression \(=r^2\); numerical value \(=9\).

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