SOLUTION: (20 - r)^1/2 = r

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Question 841804: (20 - r)^1/2 = r
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
(20 - r)^1/2 = r
(20 - r) = r^2
0=r^2+r-20
0=(r+5)*(r-4)
(20 - (-5))^1/2 = -5
25^1/2=-5
extraneous
(20 - 4)^1/2 =4
16^1/2=4