Convert r = 8cos θ to rectangular form.
a. x^2 + y^2 = 8y
b. x^2 + y^2 = 64x
c. x^2 + y^2 = 16x
d. x^2 + y^2 = 8x

D

Step-by-step explanation:

To convert from polar to rectangular form

• x = rcosΘ , y = rsinΘ

• r = ⇒ r² = x² + y²

Given

r = 8cosΘ

r = 8 × ( multiply both sides by r )

r² = 8x, hence

x² + y² = 8x ⇒ D

this may not be at all, but i use the same website you're using for school, and if i'm stuck doing one of these i try to look for it on the section.