(\left\(\sqrt{5}+2\right\)2) का मान क्या है?
What is the value of (\left\(\sqrt{5}+2\right\)2)?
Explanation opens after your attempt
A. \(9+4\sqrt{5}\)
Concept
Use ((a+b)2=a-2+2ab+b-2).
Why this answer is correct
(\(\sqrt{5}\)2+2\(\sqrt{5}\)(2)+22=5+4\sqrt{5}+4=9+4\sqrt{5}).
Exam Tip
Missing the middle term (2ab) is a common mistake. चरण 1: ((a+b)2=a-2+2ab+b-2) लगाएं। चरण 2: (\(\sqrt{5}\)2+2\(\sqrt{5}\)(2)+22=5+4\sqrt{5}+4=9+4\sqrt{5})। चरण 3: मध्य पद (2ab) को छोड़ना सामान्य गलती है।
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