x-y=2 এবং xy=3 হলে x+y এর মান?      

A    4

B    -4

C    ±4

D    ±16        

Solution

Correct Answer: Option C

 

(x+y)2=(x-y)2+4xy

(x+y)2=22+4×3

(x+y)2=16

(x+y)=±4

      

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