how do you change the rectangular equation (x+1)^2 + y^2 = 1 into polar form?
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Originally Posted by jumpman23 how do you change the rectangular equation (x+1)^2 + y^2 = 1 into polar form? Expand: $\displaystyle x^2+2x+1+y^2=1\implies x^2+y^2+2x=0$ Convert: $\displaystyle x^2+y^2+2x=0\implies r^2+2r\cos\theta=0$ Simplify (solve for r): $\displaystyle r^2+2r\cos\theta=0\implies r^2=-2r\cos\theta\implies r=-2\cos\theta$ Does this make sense?
yes it does. thank you so much for your help.
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