Question

If every pair from among the equations x2 + ax + bc = 0, x2 + bx +ca=0, x2+cx+ ab=0 has a common root, then the sum of the three common root is

1) abc

2) 2abc

3) 3(a+b+c)

4) (a+b+c)

Answer 1

2abc . because 2 commonly as well as a ,b and c