book Maths Puzzle Numerical Ability

I need to know how to find the radius and center of x2 - 2x + y2 � 16y = � 1.

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book Other Question

Find the inverse of the function
f(x)=(x-5)^2+4 Hello!
I really need help understanding polynomials. Could someone help me undestand how to factor this problem?

15x^2-1x-2

Thank very much!