Convert to Rectangular Form...5

[nycmathguy]

Question 10

r = 4

Square both sides.

r^2 = 4^2

x^2 + y^2 = 16

x^2 + y^2 - 16 = 0

You say?

 

[MathLover1]

=>

 

[nycmathguy]

View attachment 2238

=>View attachment 2239

I see. The value of r = sqrt{x^2 + y^2}.