Answer:
1. (2x + 3)(2x - 3)
2. 4 (3x² - 5)
3. (a + b)(a - b)
4. (x + 5y)(x - 5y)
5. (2x + 4)(2x - 4)
Step-by-step explanation:
1. 4x² - 9= 2x² - 3²= (2x + 3)(2x - 3)
2. 12x² - 20= 4 (3x² - 4)(5)= 4 (3x² - 5)
3. a² - b²= (a + b)(a - b)
4. x² - 25y²= x² - 5y²= (x + 5y)(x - 5y)
5. 4x² - 16= (2x)² - 4²= (2x + 4)(2x - 4)