SOLUTION: can you please help me to solve this equation? 400r=x^2-40x+400 i want the answer in r

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Question 366830: can you please help me to solve this equation?
400r=x^2-40x+400
i want the answer in r

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
400r=x^2-40x+400
r = (x^2-40x+400)/400
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Like that?
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x^2-40x+400(1-r) = 0
x = 20 ± 20*sqrt(r) or like that?