Question

Elementul absorbant va rog dau coronița

Answer 1

x * y=xy+2x+2y+2=x(y+2)+2(y+2)-2=(x+2)(y+2)-2

Elementul absorbant are proprietatea ca :

x * a= a * x = a

x * a= a

(x+2)(a+2)-2=a

(x+2)(a+2)-(a+2)=0

(a+2)(x+1)=0

a+2=0

a=-2

Atunci E=-2

Answer 2

x*y=xy+2x+2y+2=x(y+2)+2(y+2)-2=(x+2)(y+2)-2

x*a=a*x=a  

x*a=a

(x+2)(a+2)-2=a

(x+2)(a+2)-(a+2)=0

(a+2)(x+1)=0

a+2=0     ⇒   a=-2

E=-2