Question

the value of 2(ab+bc+ca) ​

Answer 1

Answer:

142

Step-by-step explanation:

(a+b+c)^2=a^2+b^2+c^2+2(ab+bc+ca)

15^2=83+2(ab+bc+ca)

2(ab+bc+ca)=225-83=142

Answer 2

Answer:

2ab+2bc+2ca

Step-by-step explanation:

The value of 2(ab+bc+ca) is 2ab+2bc+2ca.

Because we just have to multiply 2 with all the numbers inside the bracket. And we can't add it further because we can we only add the numbers with same variables.