book Maths Puzzle Numerical Ability

Please help me determine the center and radius of the circle with equation:
x^2+y^2=-4x+6y
Thank you

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book Other Question

how do you factor the trinomial? 9xsquared - 18x + 9 = 0

it would be wonderful if i could get the steps instead of just the answer, i just need help understanding how to solve the problem and others like it.
Polynomials: What is X^3-64=0?
thank you.