If 5a + 1/(3a) = 5, then the value of 9a2 + 1/(25a2) is :
यदि 5a + 1/(3a) = 5, तो 9a2 + 1/(25a2) का मान है :
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Correct answer: D. 39/5
Explanation
Multiply by 3/5: 3a + 1/(5a) = 3. Squaring: 9a² + 6/5 + 1/(25a²) = 9 → 9a² + 1/(25a²) = 39/5.
3/5 से गुणा: 3a + 1/(5a) = 3; वर्ग करने पर 9a² + 1/(25a²) = 9 − 6/5 = 39/5।
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