If common factor of x2 + bx + c and x2 + mx + n is (x + a), then the value of a is:
1
\(\frac{{c - n}}{{b - m}}\)
2
\(\frac{{c - n}}{{b + m}}\)
3
\(\frac{{c - n}}{{m - b}}\)
4
\(\frac{{c + 1}}{{b - m}}\)
If common factor of x2 + bx + c and x2 + mx + n is (x + a), then the value of a is: