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3(2p - 3q)² = 3(4p² - 12pq + 9q²) = 12p² - 36pq + 27q²
(16p² - 16pq + q²) - (12p² - 36pq + 27q²) =
16p² - 16pq + q² - 12p² + 36pq - 27q² =
Untuk variabelnya yang sama dijumlahkan terlebih dahulu.
16p² - 12p² - 16pq + 36pq + q² - 27q² =
4p² + 20pq - 26q²