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$7. \: 4x² + 4x + 1 \\ = 4x² + 2x + 2x + 1 \\ = 2x(2x + 1) + 2x + 1 \\ = (2x + 1)(2x + 1) \\ = 2x + 1² \\19. 25a² - 30a + 9 \\ = 25a² - 15a - 15a + 9 \\ = 5a(5a - 3) - 3(5a - 3) \\ =( 5a - 3)(5a - 3) \\ = (5a - 3)²$