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The power of (2,1) with respect to the c...

The power of (2,1) with respect to the circle `x^(2)+y^(2)+x=0` is

A

2

B

3

C

`sqrt(7)`

D

7

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The correct Answer is:
D
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AAKASH SERIES-CIRCLES-PRACTICE EXERCISE
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  2. The lines 2x-5y+1=0 and 10x-4y-3=0 meets the coordinate axes in concyl...

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  3. The power of (2,1) with respect to the circle x^(2)+y^(2)+x=0 is

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  4. If the line passing through P=(8,3) meets the circle S-=x^(2)+y^(2)-8x...

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  5. A chord of length 8 units is at a distance of 4 uits from the centre o...

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  6. The intercept made by the circle x^(2)+y^(2)-4x-6y-3=0 on the line x+y...

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  7. If a line is drawn through a point A(3,4) to cut the circle x^(2)+y^(2...

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  8. The condition that the chord a x cos alpha +y sin alpha -p=0" of "x^(2...

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  9. The equation of the cirlce with centre (0,0) and which cuts off a chor...

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  10. The line y=mx+c intersects the circle x^(2)+y^(2)=r^(2) in two distin...

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  11. If a chord of the circle x^(2)+y^(2)=16 makes equal intercepts of leng...

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  12. The pair of tangents from (2,1) to the circle x^(2)+y^(2)=4 is

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  13. The equation of the tangent to the circle x^(2)+y^(2)-4x+4y-2=0 at (1...

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  14. The line y=mx+c touches x^(2)+y^(2)=a^(2)hArr

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  15. The radius of the circle which has the lines x+y-1=0, x+y-9=0 as tange...

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  16. Equation of the tangent to the circle x^(2)+y^(2)=3, which is inclined...

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  17. Find the equation of the normal to the circle x^(2) +y^(2) -4x -6y ...

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  18. The number of circles that touch all the 3 lines 2x+y=3, 4x-y=3, x+y=2...

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  19. P(-9,-1) is a point on the circle x^2+y^(2)+4x+8y-38=0. The equation t...

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  20. The line x cos alpha+y sin alpha=p touches the circle x^(2)+y^(2)-2ax ...

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