Question 393711
  Determine the equation of each circle.
	a)	centre (2,-5) and radius 7
{{{(x-2)^2 + (y+5)^2 = 7^2}}}
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        b)	centre (-1,3) and passing through (4,1)
Find the distance between the 2 points, that's the radius.
Then
{{{(x+1)^2 + (y-3)^2 = r^2}}}