Question

$(a - 3)^{2} - 3a(a - 2)$

Answer 1

(a - 3)² - 3a(a - 2) = a² - 6a + 9 - 3a² + 6a = - 2a² + 9

Answer 2

(a-3)² - 3a(a-2) = (a²-6a+9)-3a²+6a = 9-2a²