Question

Find the centre of radius of x²+y²-2x+4y-4=0​

Answer 1

Answer:

Centre=(1,-2) and radius=3

Step-by-step explanation:

The equation given can be written as :

(x-1)²+(y+2)²=9

And from general equation of a circle,we have

(x-a)²+(y-b)²=r² where , (a,b)=centre and r=radius

So, by comparision we get a=1 and b= -2 .

Hence, centre of circle=(1,-2).