If the roots of be equal , then are in
A.P
G.P
H.P
None of these
H.P
Step 1: Apply condition for equal roots of a quadratic equation
For a standard quadratic equation , The Discriminant,
Comparing the given equation with the above we get
Putting values of A,B, and C in
Step 2: Using identity
As we know the above condition only holds when and are in H.P..
Therefore, option (c) is correct as forms H.P.