Question

Sendo A = {-2, 0, 1 } e b = {3,5}, escreva A X B e B X A

Answer 1

A.. (-2,0,1)• B..(3,5)

AxB
(-2•3)+(-2•5)+(0•3)+(0•5)+(1•3)+(1•5)
(-6)+(-10)+0+0+3+5=
-16+0+8=-8

(3,5)•(-2,0,1)
BxA
3•(-2)+(3•0)+(3•1)+5•(-2)+(5•0)+(5•1)
-6+0+3+(-10)+0+5
-6+(-30)+5=
-36+5=-31