a+b=7 এবং ab=12 হলে,1/a²+1/b²এর মান কত?
Solution
Correct Answer: Option B
a+b=7
ab=12
ab=12
(1/a²)+(1/b²)=(a²+b²)/a²b²
=(a+b)² -2ab/(ab)²
={(7)² -2×12}/(12)²
=(49-24)/144
=25/144
=(a+b)² -2ab/(ab)²
={(7)² -2×12}/(12)²
=(49-24)/144
=25/144
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