Question

Q.1 Find the centre and radius of the circle
x2 + y2 - x +2y – 3 = 0​

Answer 1

Step-by-step explanation:

Answer

given equation is x2+y2−x+2y−3=0 

   ⇒ (x2−2×21×x+41)+(y2+2y+1) 

    ⇒3+41+1 

   ⇒(x−21)2+(y+1)2=417 

   ∴ the centre is (21,−1) and raius is 217