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= 9p²-6pq-6pq+4q²
= 9p²-12pq+4q²
semoga membantu.
= (3p)² - 2(3p)(2q) + (2q)²
= 9p² - 12pq + 4q²
Cukup ingat :
(a - b)² = a² - 2ab + b²
Kemudian ganti nilai a dan b.