Expand : (2p+3m + 4n)
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(2p + 3m + 4n)2 = (2p)2 + (3m)2 + (4n)2 + 2 x 2p x 3m + 2 x 3m x 4n + 2 x 2p x 4n = 4p2 + 9m2 + 16n2 + 12pm + 24mn + 16pn
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