MathematicsFor the equation 5×2+px+5=0,p>0 if one root of the equation is square of the other, then p= 

For the equation 5x2+px+5=0,p>0 if one root of the equation is square of the other, then p= 

  1. A

    10

  2. B

    5

  3. C

    5

  4. D

    Both a and  b

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    Solution:

    α,α2 are the roots of  5x2+px+5=0

    α+α2=p5 and α.α2=55=1

    α3=1

    α=1.ω,ω2

    1+1=p5

    p=10

    α=ω,ω+ω2=p51=p5p=5

    α=ω2,ω2+ω4=p5ω2+ω=p5p=5

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