x2 + 10y + 25 doesn't factor neatly.
If that was x2 + 10x + 25, it would factor to (x + 5)(x + 5) or (X + 5)2
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25 squared plus 49 squared is equal to 3,026.
(5r - 4)(5r + 4)
(3y - 5)(y + 5)
(x^2 - 3x + 5)(x^2 + 3x + 5)
If: x^2+y^2 = 12x-10y-12 Then: x^2+y^2-12x+10y = -12 Completing the squares: (x-6)^2+(y+5)^2 -36-25 = -12 So: (x-6)^2+(y+5)^2 = 49 Therefore the centre of the circle is at (6, -5) and its radius is 7