emmzzzz emmzzzz

23-10-2014
Mathematics

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what is 7n-20=9(4n+1) ????

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23-10-2014

[tex]7n-20=9(4n+1)\ \ \ \ | omit\ the\ bracket\\\\ 7n-20=36n+9\ \ \ | add\ 20\\\\ 7n=36n+29\ \ \ | subtract\ 36n\\\\ -29n=29\ \ \ | divide\ by\ -29\\\\ n=-1\\\\Solution\ is\ n=-1.[/tex]

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ZackFry ZackFry

23-10-2014

7n - 20 = 9(4n + 1)
7n - 20 = 36n + 9
-7n - 20 = 36n - 7n + 9
-20 = 29n + 9
-20 - 9 = 29n - 9
-29= 29n
29n = -29
n = -1

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