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Find the harmonic mean of the roots of t...

Find the harmonic mean of the roots of the equation `(5+sqrt2)x^2-(4+sqrt5)x+(8+2sqrt5)=0`

A

2

B

4

C

6

D

8

Text Solution

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The correct Answer is:
B
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MCGROW HILL PUBLICATION-PROGRESSIONS-EXERCISES LEVEL-1 (Single Correct Answer Type Questions)
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  3. Find the harmonic mean of the roots of the equation (5+sqrt2)x^2-(4+sq...

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  10. If a,b,c are in A.P., then 2^(ax+1),2^(bx+1),2^(cx+1), x in R, are in

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  11. The rational number, which equals the number 2.bar 357 with recurring ...

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  12. The sum to infinity of the series 1+(4)/(5)+(7)/(5^(2))+(10)/(5^(3))...

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  13. If the sum of n terms of an A.P. is 3n^(2)+5n and its mth term is 164,...

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  14. If G1 and G2 are two geometric means and A is the arithmetic mean inse...

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  17. The value of 2^(1/4).4^(1/8).8^(1/16),,,,,,,oo is equal to.

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  18. . The sum of an infinite number of terms of a G.P. is 20, and the sum ...

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  19. The eighth term of a geometric progression is 128 and common ratio is ...

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  20. l, m,n are the p^(th), q ^(th) and r ^(th) term of a G.P. all positive...

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