Question

if you don't know the answer please don't give if you know the answer please give the answer please plz plz ​​

Answer 1

Step-by-step explanation:

(a+b+c)²=a²+b²+c²+2(ab)

(0)²=16+2(ab+bc+ca)

a+b+c=and a²+b²+c²=

2(ab+bc+ca)= -16

ab+bc+ca= -8