Easy
1 point
ID: #23944
Question
a + b = 7 এবং ab = 12 হলে, 1/a^2 + 1/b^2 এর মান কত?
Options
1
3/25
Correct Answer
2
25/144
Correct Answer
3
31/144
Correct Answer
4
11/49
Correct Answer
Explanation
1/a² + 1/b² = (a²+b²)/(ab)² = ((a+b)²-2ab)/(ab)² = (7² - 2×12) / 12² = (49-24)/144 = 25/144।