Please help me to elaborate (p+q)^2-2pq… because if opened up bracket is doubl

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secondary 2 | Maths
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secondary 2 Maths

Please help me to elaborate (p+q)^2-2pq… because if opened up bracket is double p^2+q^2, why 2pq can minus it?

Date Posted: 7 years ago

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Date Posted: 7 years ago