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Verified answer
A. x²+y²=r²3²+(-2)²=r²
9+4=r²
r=√13
<=> x²+y²=13
b. (x+3)²+(y-1)²=6²
x²+6x+9+y²-2y+1=36
x²+y²+6x-2y-26=0