could anyone please explain how to solve this question? i still do not understan

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secondary 4 | E Maths
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could anyone please explain how to solve this question? i still do not understand how to do this despite looking at the answer key. please and thank you!!

Date Posted: 8 months ago

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See if this helps

Date Posted: 8 months ago

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((5n+1)+(5n-1)) ((5n+1)-(5n-1))
=(10n) (2)
=20n

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Date Posted: 8 months ago

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