যদি a+b= √5 এবং a-b= √3 হয়, তবে a²+b²= কত?
Solution
Correct Answer: Option A
আমরা জানি,
2(a2 +b2 ) = (a+b)2 + (a-b)2
= (√5)2 + (√3)2
= 5 + 3
= 8
=> a2 + b2 = 8/2
a2 + b2 = 4
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