(a+2)(a-1)-(a+1)(a-2)

Question

(a+2)(a-1)-(a+1)(a-2)

Answer 1

(a^2 - a + 2a - 2) - (a^2 +a - 2a - 2) = a^2 - a^2 - a - a + 2a + 2a - 2 + 2 = 2a

Answer 2

(a²-a+2a-2)-(a²-2a+a-2)=a²-a+2a-2-a²+2a-a+2=2a