write polar to rectangluar form...please help

Question

 r=4 cos 0

Answer 1

x = rcosθ

y = rsinθ

x²+y² = r²

 

Since r = 4cosθ, r² = 4rcosθ

 

                      x²+y² = 4x

 

                      x²-4x+y² = 0

 

          Complete the square:  (x²-4x+4) + y² = 4

 

                                          (x-2)² + (y-0)² = 4

 

          This is a circle with center (2,0) and radius 2.  

 

 

Answer 2

1.  This submission is a duplicate by the same student.

2.  Correction: rectangular!