What is the rectangular form of the polar equation?
r−rcosθ=8
r = sqrt( x2 + y2 ) x = r·cos( theta )
r - r·cos( theta ) = 8 ---> sqrt( x2 + y2 ) - x = 8
sqrt( x2 + y2 ) = x + 8
squaring: x2 + y2 = x2 + 16x + 64
y2 = 16x + 64