if `(7m + 2n)/(7m - 2n) = 5/3`use properties of proportion to find
1) m:n
2)`(m^2 + n^2)/(m^2 - n^2)`
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Solution
`(7m + 2n)/(7m - 2n) = 5/3`
ByComponendo Divinendo, we get
`(7m + 2n + (7m - 2n))/(7m+2n -(7m - 2n)) = (5+3)/(5-3)`
`=> "14m"/"4n" = 8/2`
`=> "7m"/"2n" = 4/1`
`=> m/n = 8/7`
`=> m:n = 8:7``
2) `m/n = 8/7 => m^2/n^2 = 8^2/7^2`
Applying Componendo Divinendo, we get
`=> (m^2 +n^2)/(m^2 - n^2) = (8^2 + 7^2)/(8^2 - 7^2)`
`=> (m^2+n^2)/(m^2-n^2) = (64+49)/(64-49)`
`=> (m^2+n^2)/(m^2-n^2) = 113/15`
Concept: Componendo and Dividendo Properties
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