after the -5 cos the symbole is there.
multiply both sides by r
r^2 = -5r cos theta
since r^2 = x^2 + y^2 and x = rcos theta
(x^2 + y^2) = -5x
complete the square:
x^2 +5x + (5/2)^2 + y^2 = (5/2)^2
(x + 5/2)^2 + y^2 = 25/4
This is an equation of a circle with center at (-5/2,0) and radius r = 5/2
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