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If the roots of a quardiatic equation x^3-px^2 +qx-r =0 are in Arithmetic Progression (AP) Then which is the correct relation -
A) 2p^3=9pq-27r
B) 2q^3=9pq-27r
C) p^3 = 9pq-27r
D) 2p^3=9pq+27r
If the roots of a quardiatic equation
A)
B)
C)
D)
1 Answer
Explanation:
We have cubic eqn.
Let ,
So ,
Given that ,
From
From
From (4)
Using
Note :
If