How to solve (0.4p - 0.5q)2

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Solution

(0.4p - 0.5q)2
(a-b)^2 = a^2 + b^2 -2ab
(0.4p - 0.5q)2 = .16p^2 + 0.25q^2 - 2 (0.4p) (0.5q)\
= .16p^2 + 0.25q^2 - 0.4 pq

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