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= 9p² - 4p² - 4pq + 5pq - q² - 3q²
= 5p² + pq - 4q²
9p^2-4p^2-4pq+5pq-q^2-3q^2=
5p^2-pq-4q^2.
Tolong beri tanda jawaban tercerdas, thx.