exam Maths Puzzle Numerical Ability

x2-13x+22+0

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1^2 + b^2 = 2 (Pythagorean theorem) please help me with this problem. It is from a mathe work sheet. Thnak you.

Find the center and the radius of the circle.

4.) x2 + 12x + 36 + (y-4)2 = 49