How do you convert #9=(4x+7)^2+(-y+7)^2# into polar form? Trigonometry The Polar System Converting Between Systems 1 Answer Bdub Apr 15, 2016 #16r^2cos^2theta+r^2sin^2theta+56rcostheta-14rsintheta+89=0# Explanation: #9=16x^2+56x+49+y^2-14y+49# #0=16x^2+56x+y^2-14y+49+49-9# #0=16x^2+y^2+56x-14y+89# Now use the formulas #x=rcos theta and y=rsintheta# #0=16r^2cos^2theta+r^2sin^2theta+56rcostheta-14rsintheta+89# Answer link Related questions How do you convert rectangular coordinates to polar coordinates? When is it easier to use the polar form of an equation or a rectangular form of an equation? How do you write #r = 4 \cos \theta # into rectangular form? What is the rectangular form of #r = 3 \csc \theta #? What is the polar form of # x^2 + y^2 = 2x#? How do you convert #r \sin^2 \theta =3 \cos \theta# into rectangular form? How do you convert from 300 degrees to radians? How do you convert the polar equation #10 sin(θ)# to the rectangular form? How do you convert the rectangular equation to polar form x=4? How do you find the cartesian graph of #r cos(θ) = 9#? See all questions in Converting Between Systems Impact of this question 1076 views around the world You can reuse this answer Creative Commons License