(x-2)²+(y+4)²=64 , find the radius and centre of circle
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=(x-2)²+(y+4)²=64
=x²-4x+4 + y²+8y+16=64
=x²+y²-4x+8y+4+16=64
=x²+y²-4x+8y+20=64
=x²+y²-4x+8y=64-20
=x²+y²-4x+8y=44
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