a-b=4 এবং ab=60 হলে a+b এর মান কত ?

A 15

B 16

C 136

D 256

Solution

Correct Answer: Option B

দেওয়া আছে ,a-b=4
              এবং ab =60
অতএব ,(a+b)²=(a-b)²+4ab
                      =(4)²+4.60
                      =16+240
বা, (a+b)²=256
∴ a+b=16

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