Yahoo Answers: Answers and Comments for (r2)/(r+2)2r/(r+9)=6? [Mathematics]
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Tue, 04 May 2010 17:21:48 +0000
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Yahoo Answers: Answers and Comments for (r2)/(r+2)2r/(r+9)=6? [Mathematics]
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https://answers.yahoo.com/question/index?qid=20100504172148AAiiCM8
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From Anonymous: [(r2)(r+9) 2r(r+2)] / [(r+2)(r+9)] = 6
(r^2...
https://answers.yahoo.com/question/index?qid=20100504172148AAiiCM8
https://answers.yahoo.com/question/index?qid=20100504172148AAiiCM8
Tue, 04 May 2010 17:50:07 +0000
[(r2)(r+9) 2r(r+2)] / [(r+2)(r+9)] = 6
(r^2 + 7r 18 2r^2  4r) / [(r+2)(r+9)] = 6
(r^2 + 3r  18) / (r^2 + 11r + 18) = 6
r^2 + 3r  18 = 6(r^2 + 11r + 18) = 6r^2 + 66r + 108
7r^2 + 63r + 126 = 0
(7r + 42)(r+3) = 0
r = 6; r = 3
Using r = 6:
(8/4)  (12/3) = 6 ==> 2/1 + 4/1 = 6
Using r = 3
(5/1)  (6/6) = 6 ==> 5/1 + 1/1 = 6