(а-2)(а+1)-(а+3)(а-5) При а= -1/2

Question

(а-2)(а+1)-(а+3)(а-5)
При а= -1/2

Comments

1a×2a-4a×4a=1-1/2-2-1/2-4-1/2

Answer 1

(a-2)(a+1)-(a+3)(a-5)=a^2-a-2-a^2+2a+15=a+13=-1/2+15=12,5

Answer 2

50/4= 12.5 ))))))))))))