Question

Write the polar equation in rectangular form r=-12 sinè

Answer 1

You should know that
r^2 = x^2 + y^2 and sinØ = y/r

so in r = - 12sinØ
r = -12y/r
r^2 = -12y
x^2 + y^2 = -12y

Answer 2

x^2+y^2-4x-12y+31=0