+0  
 
0
83
1
avatar

Find the radius of the circle with equation x^2 + y^2 = 6x + 8y.

 Jul 18, 2020
 #1
avatar+28021 
+1

Put it into standard circle form   (x-h)^2 + (y-k)^2 = r^2    

 

x^2 - 6x         + y^2 -8y        = 0    complet ehte square for 'x' and 'y'

(x-3)^2           + (y-4)^2       =  9+16 = 25        soooooo      r^2 = 25      r = 5

 Jul 18, 2020

14 Online Users