Question

If the circle x² + y2 - 4x +6y+a = 0 has radius 4 then find a ,b Ask for details Follow Report by

Answer 1

Step-by-step explanation:

Given equation is

x

2

+y

2

+4x+6y+13=0

or (x

2

+4x+4)+(y

2

+6y+9)+13=4+9

or (x+2)

2

(y+3)

2

=0

∴ Radius of circle =0.

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