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2025 CCHY PRELIMS P1 Q4
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2025 CCHY PRELIMS P1 Q4
Secondary 4
3 marks
Simplify \((4n)^2-(4n+a)(4n-a)\).
[1]
Hence, without the use of a calculator, evaluate \(75^2-(78)(72)\).
[2]
Solution:
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Answer:
(a) \(a^2\) (b) \(9\)
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