Question

If the harmonic mean between roots of   is 4 then b equals

                                            

Solution

Correct option is

Let α, β be the roots of (1), then

         

 

SIMILAR QUESTIONS

Q1

Let α, β be the roots of the equation x2 – ax + b = 0 and An = αn + βn

Q2

Let f (x) = ax2 + bx + cabc Ïµ R. if f (x) takes real values for real values of x and non – real values for non – real values of x, then.

Q3

If α, β, γ are such that α + β + γ = 2, α2 + β2 + γ2 = 6, α3 + β3 + γ3 = 8, then α4 + β4 + γ4 is

Q4

The condition that the equation  has real roots that are the equal in magnitude but opposite in sign is

Q5

If x is real, and 

Q6

Let a > 0, b > 0 and c > 0. Then both the roots of the equation ax2 + bx +c = 0

Q7

Let abc be non – zero real number such that

               

         

Then the quadratic equation ax2 + bx + c = 0 has

Q9

The equation 3x–1 + 5x–1 = 34 has

Q10

In a triangle PQRR = π/4. If tan (P/3) and tan (Q/3) are the roots of the equation ax 2 + bx + c = 0, then