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= 64a⁴ + 48a² + 9
2. (6a - 5b)² = (6a)² - 2(6a)(5b) + (5b)²
= 36a² - 60ab + 25b²
3. (4a + 9b)² = (4a)² + 2(4a)(9b) + (9b)²
= 16a² + 72ab + 81b²
4. (5a - 7)² = (5a)² - 2(5a)(7) + 7²
= 25a² - 70a + 49