Question

the centre of circle 3x^2 + 3y^2 -6x +9y -1 is​

Answer 1

Answer:

Step-by-step explanation:

The general equation of circle is $x^2+y^2+ 2gx + 2fy+c= 0$ where g & f are the co-ordinates of the center of circle

$3x^2 + 3y^2 -6x +9y -1$ ........ Given equation (1)

Compare equation (1) with $x^2+y^2+ 2gx + 2fy+c= 0$

so g = -3 & f= 4.5

So the co-ordinates of center are (g ,f)≡(-3,4.5)