Expanding the expression, we get:
= (4 - 2a)(4 - 2a) - (3a(6) - 3a(a) - 2(6) + 2a) + a²= (16 - 8a - 8a + 4a²) - (18a - 3a² - 12 + 2a) + a²= 16 - 16a + 4a² - 18a + 3a² + 12 - 2a + a²= 4a² + 3a² + a² - 16a - 18a - 2a + 16 + 12= 8a² - 36a + 28
Therefore, the simplified expression is 8a² - 36a + 28.
Expanding the expression, we get:
= (4 - 2a)(4 - 2a) - (3a(6) - 3a(a) - 2(6) + 2a) + a²
= (16 - 8a - 8a + 4a²) - (18a - 3a² - 12 + 2a) + a²
= 16 - 16a + 4a² - 18a + 3a² + 12 - 2a + a²
= 4a² + 3a² + a² - 16a - 18a - 2a + 16 + 12
= 8a² - 36a + 28
Therefore, the simplified expression is 8a² - 36a + 28.