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What’s the answer to these?
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What’s the answer to these?

What’s the answer to these?-example-1
User TotallyNotLizards
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1 Answer

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Hello,


x^2+y^2-4x+2y-4=0\\\\<=> (x-2)^2-2^2+(y+1)^2-1^2-4=0 \\ \\<=>(x-2)^2+(y+1)^2=9


(x+2)^2+(y-3)^2=9\\\\<=> x^2+4x+4+y^2-6y+9=9\\ \\<=>x^2+y^2+4x-6y+4=0

Thanks

User C Roald
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