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If the circles x^2+y^2=9 and x^2+y^2+8y+...

If the circles `x^2+y^2=9` and `x^2+y^2+8y+c=0` touch each other, then c is equal to:

A

-15

B

15

C

16

D

none of these

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JBD PUBLICATION-MODEL PAPER (11)-EXERCISE
  1. If 1+2+3+……………+n=45, then 1^3+2^3+3^3+…………+n^3 is:

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  2. If p be the length of the perpendicular from the origin on the line x/...

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  3. If the circles x^2+y^2=9 and x^2+y^2+8y+c=0 touch each other, then c i...

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  4. If f(x)=(x-4)/(2sqrt3), then f'(1) is equal to?

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  5. If A and B are two events, the probability that exactly one of them oc...

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  6. Prove that: cos20^@+cos100^@+cos140^@=0.

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  7. If tan3A=(3 tan A+k tan^(3)A)/(1-3 tan^(2)A), then k is equal to

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  8. Evaluate: [i^20+(1/i)^26]^3.

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  9. Using Binomial theorem prove that:(1.1)^10000> 10000

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  10. Write the general term in the expansion of (x^(2)-yx)^(12), x ne 0

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  11. Let (4, 2), B (6, 5) and C (1, 4) be the vertices of triangleABC. :- ...

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  12. Verify by the method of contradiction that sqrt7 is irrational.

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  13. Find the component statement of the following and check whether they a...

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  14. Assume that P(A) = P(B). Show that A = B

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  15. If AxxB={(a,x),(a,y),(b,x),(b,y)}. Find A and B

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  16. Prove that : sin (A + B) sin (A - B) = sin^2A- sin^2B.

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  17. Using principle of mathematical induction, prove that: 1/1.2.3+1/2.3.4...

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  18. Determine the number of ways of choosing 5 cards out of a deck of 52 c...

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  19. A question paper has two parts: Part A and Part B. each part containin...

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  20. A.M. between two numbers is 10 and their G.M is 8. Find the numbers.

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