Question:`a - = x^2 + y^2 - z^2` এবং `b = y^2 + z^2 - x^2`হয় , a + b 

= কত ? 

A `2y^2` 
B `2x^2` 
C `4x^` 
D `4z^2` 

+ Answer
A 

+ Explanation
`a + b = x^2 + y^2 - z^2 + y^2 + z^2 - x^2 = 2y^2`

+ Report

Irin Moni

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