a+b=7 এবং ab=12 হলে, 1/a2+1/b2 এর মান কত?

a+b=7 এবং ab=12 হলে, 1/a²+1/b² এর মান কত?

A 25/144

B 9/112

C 6/122

D 8/133

Solution

Correct Answer: Option A

a + b = 7...............(1)
ab = 12..................(2)

এখন,
(1/a²) + (1/b²)
= (b² + a²)/a²b²
= {(a + b)² - 2ab}/(ab)²
= {7² - 2 × 12}/(12)²
= (49 - 24)/144
= 25/144

Solution

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