Question

(a-2)(a+4)-(a+1)^2 при a=-1/12

Answer 1

(a-2)(a+4)-(a+1)^2
а^2+4a-2a-8-(a^2+2a+1)
a^2+2a-8-a^2-2a-1
-8-1
-9 

Answer 2

а^2 + 4a - 2a -8 - a^2 - 2a - 1 = -8 -1 = -9