If the coefficients of the equation whose roots are k times the roots of the equation , are integers, then a possible value of k is
3
12
9
4
The harmonic mean of two numbers is and their geometric mean is 2. The quadratic equation whose roots are twice those numbers is
1
2
- 1
- 2
C.
- 1
If z1, z2 are complex numbers such that Re(z1) = |z1 = 1| and Re(z2) = |z2 = 1| and arg (z1 – z2) = , then Im (z1 + z2) is equal to :