book Maths Puzzle Numerical Ability

find center and radius of this circle

x^2+y^2+6x-4y+5=0

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I could not figure this question out....3y2-2brackety-(3-2y)bracket=3(y-2)to the 2nd power -12? The choices are a)0 and -1 B)0 and -2 C)0 D)-1 E)-2 Thank you for your time. What is the sum of 4a to the 2nd -7a-5 and -6a to the 2nd -2a + 7