a + b = 12 এবং ab = 35 হলে a2 + b2 এর মান কত?

A 74

B 70

C 140

D 128

Solution

Correct Answer: Option A

দেওয়া আছে,
এবং ab = 35
.: a2 + b2 = (a + b)2 - 2ab
               = 12² - 2.35
               = 144-70
               = 74

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