If p 2 +q 2 = 252 and p+q=16 evaluate pq
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p+q=16
p²+q²=252
or, (p+q)²-2pq=252
or, (16)²-2pq=252
or, 256-2pq=252
or, -2pq=252-256
or, -2pq=-4
or, pq=4/2
or, pq=2
p²+q²=252
or, (p+q)²-2pq=252
or, (16)²-2pq=252
or, 256-2pq=252
or, -2pq=252-256
or, -2pq=-4
or, pq=4/2
or, pq=2
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