Question:If `x : y = 2 : 1`, then `(x^2 - y^2) : (x^2 + y^2)` is : 

A `3 : 5` 
B `5 : 3` 
C `1 : 3` 
D `3 : 1` 

+ Answer
A 

+ Explanation
`x/y = 2/1 => x^2/y^2 = 4/1`.

`:. (x^2 - y^2)/(x^2 + y^2)`

 `=(4 - 1)/(4 + 1)`
 
 `= 3/5`

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Md. Habib Ullah

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