(\(\sqrt{19}+4\)2-\(\sqrt{19}-4\)2) का मान क्या है?
What is the value of (\(\sqrt{19}+4\)2-\(\sqrt{19}-4\)2)?
Explanation opens after your attempt
Correct Answer
A. \(16\sqrt{19}\)
Concept
Use ((a+b)2-(a-b)2=4ab). Here \(a=\sqrt{19}\) and (b=4), so the value is \(16\sqrt{19}\).
Why this answer is correct
The correct answer is A. \(16\sqrt{19}\). Use ((a+b)2-(a-b)2=4ab). Here \(a=\sqrt{19}\) and (b=4), so the value is \(16\sqrt{19}\).
Exam Tip
पहचान ((a+b)2-(a-b)2=4ab) लगाएं। यहाँ \(a=\sqrt{19}\) और (b=4), इसलिए मान \(16\sqrt{19}\) है।
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