Question

a+b+c=m,a²+b²+c²=n then ab+BC+CA=?​

Answer 1

Answer:

the answer is ab+bc+ca=o

Answer 2

Step-by-step explanation:

a+b+c= m

squaring on both sides

a^2+b^2+c^2+2ab+2bc+2ca=m^2

substitute the values

n+2(ab+bc+ca)=m^2

2(ab+bc+ca)=m^2-n

ab+bc+ca=m^2-n÷2

hence the answer is m^2-n÷2

the other number on do you keep answer 0 it is not correct