a - b = 3, ab =4 হলে, a2 + b2 এর মান কত?

A 12

B 15

C 17

D 20

Solution

Correct Answer: Option C

দেওয়া আছে, 
a - b = 3,
ab = 4 

আমরা জানি,
a2 + b2 = (a - b)2 + 2ab
            = 32 + 2 × 4
            = 9 + 8
            = 17

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