Question

x2+y2+4x-2y=-1

the equation of a circle in the xy_plane is shown above. what is the radius of the circle?

A) 2

B) 3

C) 4

D) 9

please find it​

Answer 1

Answer:

this is the ans.

Step-by-step explanation:

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Answer 2

Answer:

option A) 2

Step-by-step explanation:

x

2

+y

2

+4x−2y+1=0

Comparing with x^{2}+ y^{2}+2gx+2fy+c=0x

2

+y

2

+2gx+2fy+c=0

g= 2 f=-1 c=1

Radius =\sqrt{g^{2}+f^{2} -c }

g

2

+f

2

−c

=\sqrt{4+1-1}

4+1−1

= \sqrt{4}

4

Radius = 2

• radius = √4 = 2