1) (2a-5)² = 4a² - 20a + 25
2) (5+8m)² = 25 + 80m + 64m²
3) (2a-3)(2a+3) = 4a² - 9
4) (5d+2)(5d-2) = 25d² - 4
1) (2a-5)² = 4a² - 20a + 25
2) (5+8m)² = 25 + 80m + 64m²
3) (2a-3)(2a+3) = 4a² - 9
4) (5d+2)(5d-2) = 25d² - 4