कौन सा विकल्प (\(\sqrt{7}-\sqrt{3}\)2) का सही विस्तार है?
Which option is the correct expansion of (\(\sqrt{7}-\sqrt{3}\)2)?
Explanation opens after your attempt
A. \(10-2\sqrt{21}\)
Concept
(\(\sqrt{7}-\sqrt{3}\)2=7+3-2\sqrt{21}). Apply the (2ab) term carefully in the square formula.
Why this answer is correct
The correct answer is A. \(10-2\sqrt{21}\). (\(\sqrt{7}-\sqrt{3}\)2=7+3-2\sqrt{21}). Apply the (2ab) term carefully in the square formula.
Exam Tip
(\(\sqrt{7}-\sqrt{3}\)2=7+3-2\sqrt{21}) है। वर्ग सूत्र में (2ab) पद सावधानी से लगाएँ।
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