Помогите упростить 3a(a-2)-(a-3)(a-1)

Question

Помогите упростить 3a(a-2)-(a-3)(a-1)

Answer 1

3а^2-6a-(a^2-a-3a+3)=3a^2-6a-a^2+a+3a-3=2a^2-2a-3

Answer 2

3a(a - 2) - (a - 3)(a - 1) = 3a² - 6a - (a² - a - 3a + 3) = 3a² - 6a - (a² - 4a + 3) = 3a² - 6a - a² + 4a - 3 = 2a² - 2a - 3 = 2a² - 2a - 3