find the centre and radius of 4x²+4y²-4x+12y-15=0
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divide by 4,
It becomes
x²+ y²-x+3y-15/4=0
g=-1/2 f=3/2
Centre =(-g,-f)=(1/2,-3/2)
Radius=√g² +f²-c
=√1/4+9/4+15/4=√25/4=5/2=2.5
It becomes
x²+ y²-x+3y-15/4=0
g=-1/2 f=3/2
Centre =(-g,-f)=(1/2,-3/2)
Radius=√g² +f²-c
=√1/4+9/4+15/4=√25/4=5/2=2.5
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