(\(2+\sqrt{5}\)2) का प्रसार कौन-सा है?
Which is the expansion of (\(2+\sqrt{5}\)2)?
Explanation opens after your attempt
A. \(9+4\sqrt{5}\)
Concept
(\(2+\sqrt{5}\)2=4+4\sqrt{5}+5=9+4\sqrt{5}). Do not forget the middle term while squaring.
Why this answer is correct
The correct answer is A. \(9+4\sqrt{5}\). (\(2+\sqrt{5}\)2=4+4\sqrt{5}+5=9+4\sqrt{5}). Do not forget the middle term while squaring.
Exam Tip
(\(2+\sqrt{5}\)2=4+4\sqrt{5}+5=9+4\sqrt{5}) है। वर्ग करते समय मध्य पद न भूलें।
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