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If a,b,c are in GP, show that the equati...

If `a,b,c` are in GP, show that the equations `ax^(2)+2bx+c=0` and `dx^(2)+2ex+f=0` have a common root if `a/d,b/e,c/f` are in HP

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MODERN PUBLICATION-SEQUENCES AND SERIES-EXERCISE
  1. We are given two G.P.'s, one with the first term 'a' and common ratio ...

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  2. If Sn represents the sum of n terms of a G.P. whose first term and com...

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  3. If a,b,c are in GP, show that the equations ax^(2)+2bx+c=0 and dx^(2)+...

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  4. Find the derivative of the following y=x+1/x+sinx

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  5. The sum of the first three consecutive terms of G.P. is 13 and the sum...

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  6. If 1/(a+b)+1/(b+c)=1/b, prove that a, b, c are in G.P.

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  7. 150 workers were engaged to finish a job in a certain number of days. ...

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  8. The height of a plant at a certain date is 1.6 metre. If it increases ...

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  9. If |x|<1 and |y|<1, find the sum to infinity of the series : (x+y)+(x^...

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  10. A manufacturer reckons that the value of a machine, which costs him Rs...

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  11. Prove the following by using the principle of mathematical induction f...

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  12. Find the sum of the series 1*n+2*(n-1)+3*(n-2)+4*(n-3)+"..."+(n-1)*2+n...

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  13. Find the sum of n terms\ of the series: 1/(1. 2)+1/(2. 3)+1/(3. 4)+do...

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  14. Obtain the sum of the series : 1/1.4+1/4.7+1/7.10 + .......... to n t...

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  15. Find the sum of n terms of the series (1)/(1+1^(2)+1^(4))+(2)/(1+2^(2)...

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  16. Show that : (1 xx 2^2+2 xx 3^2+. .+n xx(n+1)^2)/(1^2 xx 2+2^2 xx 3+. ...

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  17. What will Rs 500 amounts to in 10 years after its deposit in a bank wh...

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  18. A man deposited ₹ 10,000 in a bank at the rate of 5% simple interest a...

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  19. If a, b, c are in A.P. then 3^a, 3^b, 3^c are in:

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  20. If the third term of an A.P is 12 and the seventh term is 24, then the...

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