1.

Find the centre and radius of the circle `(x-2)^(2)+(y+5)^(2)=49`

Answer» `(x-2)^(2)+(y+5)^(2)=49`
`rArr(x-2)^(2)+(y-5)^(2)=7^(2)`
Comparing with the equation of circle
`(x-h)^(2)+(y-k)^(2)-a^(2)`
`h=2,k=-5,a=7`
`:.` Centre of circle `-(h,k)=(2,-5)`
and radius `a=7`.


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