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Write (p + 2q + r)^2 in expanded form.

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Write (p + 2q + r)2 in expanded form.

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(p + 2q + r)2 = (p)2 + (2q)2 + (r)2 + 2 (P) (2q) + 2 (2q) (r) + 2(r) (p) 

= p2 + 4q2 + r2 + 4pq + 4qr + 2rp

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