Question

If A+B+C= 13 AND A^2+B^2+C^2=69

Answer 1

Answer:

Step-by-step explanation:

a+b+c=13

squaring on both sides

(a+b+c)^2=13^2

a^2+b^2+c^2+2ab+2bc+2ca=169

69+2ab+2bc+2ca=169

2(bc+ca+ab)=169-69

bc+ca+ab=100/2=50

Answer 2

.....Hey mate refer the above attachment....

...U can understand easily....