-3p² - 5q² + 4pq from 5p² + 3q² - pq
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Step-by-step explanation:
5p^2+3q^2-pq-(-3p^2-5q^2+4pq)
=5p^2+3q^2-pq+3p^2+5q^2-4pq
=8p^2+8q^2-5pq
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