How do you convert $r = - 5 Cos theta$ to rectangular form?

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Answer 1 · 2016-10-09T00:12:23

$x^2+y^2=-5x$

$x^2+y^2=r^2$

$r^2=-5rcostheta->$ multiply both sides by r

So $x^2+y^2=-5rcostheta$

Recall that $x=rcostheta$

So $x^2+y^2=-5x$

How do you convert r = - 5 Cos thetar = - 5 Cos theta to rectangular form?