किस विकल्प में (\(3\sqrt{5}-2\sqrt{7}\)^{2}) का सही विस्तार है?
Which option gives the correct expansion of (\(3\sqrt{5}-2\sqrt{7}\)^{2})?
Explanation opens after your attempt
Correct Answer
A. \(73-12\sqrt{35}\)
Concept
Here (\(3\sqrt{5}\)^{2}=45), (\(2\sqrt{7}\)^{2}=28), and the middle term is \(12\sqrt{35}\). Therefore, the expansion is \(73-12\sqrt{35}\).
Why this answer is correct
The correct answer is A. \(73-12\sqrt{35}\). Here (\(3\sqrt{5}\)^{2}=45), (\(2\sqrt{7}\)^{2}=28), and the middle term is \(12\sqrt{35}\). Therefore, the expansion is \(73-12\sqrt{35}\).
Exam Tip
(\(3\sqrt{5}\)^{2}=45), (\(2\sqrt{7}\)^{2}=28), और मध्य पद \(12\sqrt{35}\) है। इसलिए विस्तार \(73-12\sqrt{35}\) है।
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