a - b = 8 এবং ab = 4 হলে (a + b)2 এর মান কত?

A 80

B 70

C 90

D 60

Solution

Correct Answer: Option A

a + b)² = (a - b)² + 4ab
           = (8)² + 4.4
           = 64 + 16
           = 80

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