Question:Expression `(11.98 xx 11.98 + 11.98 xx x + .02 xx .02)`will be perfect square for equal to : 

A ` .02` 
B ` .2` 
C ` .04` 
D ` 0.4` 

+ Answer
C 

+ Explanation
Given Exp :

`= (11.98)^2 + (.02)^2 + 11.98 xx x`

 For the given expession to be a perfect square , we must have 

`11.98 xx x`

`= 2 xx 11.98 xx .02` 0r x`=.04`

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Irin Moni

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