If,x-y=5,xy=6,then x+y=?

A 7

B ±7

C 1

D none

Correct Answer: Option B

দেওয়া আছে,
            x-y=5
             xy=6
এখন, (x+y)²+4xy
         =(5)²+4.6
         =25+24
বা, (x+y)²=49
অতএব ,x+y=±7