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Verified answer
Materi : Selisih KuadratRumus dasar :
a² - b² = (a + b)(a - b)
Pembahasan :
9(a + 2b)² - 4(2a - 3b)²
= 3²(a + 2b)² - 2²(2a - 3b)²
= [3(a + 2b)]² - [2(2a - 3b)]²
= (3a + 6b)² - (4a - 6b)²
= (3a + 6b + 4a - 6b)(3a + 6b - 4a + 6b)
= (7a)(12b - a)
= 84ab - 7a²