Easy
1 point
ID: #26881
Question
a+1/a=3 হলে a²+1/a²= কত?
Options
1
11
Correct Answer
2
13
Correct Answer
3
7
Correct Answer
4
9
Correct Answer
Explanation
আমরা জানি, $a^2 + \frac{1}{a^2} = (a + \frac{1}{a})^2 - 2\cdot a \cdot \frac{1}{a}$। মান বসিয়ে পাই, $(3)^2 - 2 = 9 - 2 = 7$।
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Type
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