With this problem it ask to convert r=-3 cos(theta) from polar form to cartesian
This is what I get
However the answer given is as below. What have I done wrong?
If the polar coordinate is defined as:
r=-3 cos(theta) becomes
r=-3x/r that is, r^2=-3x
so that x^2+y^2=-3x.
Please adjust the above argument to the appropriate polar coordinate you are using...