Question

(a-5) (a+3) +2a+15 при а=-1

Answer 1

$(a^2+3a-5a-15)+2a+15=a^2=1$

Answer 2

(a-5)(a+3)+2a+15 = a^2+3a-5a-15+2a+15 = a^2
при а=-1
(-1)^2 = 1
Ответ: 1