a - b = 7, ab = 60 হলে, a2 + b2 = কত?

A 180

B 168

C 169

D 170

Solution

Correct Answer: Option C

দেওয়া আছে- a - b = 7, ab = 60 

এখানে,
(a - b)2 + 2ab =
= (7)2 + 2.60 
= 49 + 120
= 169 

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