Question 1101114
how to find the radius and center of 25x^2+25y^2-20x+30y+13=0
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Complete the squares of x & y separately
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{{{25x^2+25y^2-20x+30y = -13}}}
{{{x^2 - 0.8x + y^2 + 0.6y = -0.52}}}
{{{x^2 - 0.8x 0.16 + y^2 + 0.6y + 0.09 = -0.52+0.16+0.09}}}
{{{(x - 0.4)^2 + (y -  0.3)^2 = -0.27}}}
The r^2 term is negative.
Not a circle.
Typo maybe?
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