Question 517509
Find the coordinates of all points that are on the line x=y and are five units from (3,-1).
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It's the 2 points of intersection of the line and a circle of radius 5 centered at (3,-1).
The circle is {{{(x-3)^2 + (y+1)^2 = 25}}}
x = y
{{{(x-3)^2 + (x+1)^2 = 25}}}
{{{2x^2 - 4x - 15 = 0}}}
*[invoke solve_quadratic_equation 2,-4,-15]
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x,y = 1 + sqrt(8.5)
x,y = 1 - sqrt(8.5)