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

A 8  

B 27  

C 16

D 10

Solution

Correct Answer: Option A

(a-b)²= (a+b)²-4ab
= (4)²- 4 x 2
= 16- 8
= 8

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