Question

a+b+c =18 and a² + b²+c²=70
then value of ab+bc+ca is :





​

Answer 1

Answer:

254

Step-by-step explanation:

(a+b+c)²=(a²+b²+c²)+ab+bc+ca

(18)²=(70)+ab+bc+ca

324-70=ab+bc+ca

ab+bc+ca=254