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Would someone mind helping me to understand how to find the answer to this problem? Thank you!

 Aug 15, 2018
 #1
avatar+100519 
+2

r =      5 / [ 1 + cos θ]

 

Note :  r = √ [ x^2 + y^2]       and    cos θ  =  x / r   

 

So we have

 

r = 5 / [ 1 + x/r ]

 

r [ 1 + x / r]  =   5

 

r  + x  = 5

 

 √ [ x^2 + y^2]  +  x  = 5      subtract  x from both sides

 

 √ [ x^2 + y^2]   =  5  - x      square both sides

 

x^2 + y^2 =  25  - 10x  + x^2       subtract x^2 from  both sides

 

y^2  = 25 - 10x

 

 

cool cool cool

 Aug 15, 2018

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