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(10p^2 -19pq +6q^2)
semoga benar..
= (2p × 5p + 2p × - 2q) (-3q × 5p - 3q × - 2q)
= 10p² - 4pq - 15pq + 6q²
= 10p² - 15pq - 4pq + 6q²
= 10p² - 19pq + 6q²