( \(2+\sqrt{19}\)\(2-\sqrt{19}\) ) का मान क्या है?
What is the value of ( \(2+\sqrt{19}\)\(2-\sqrt{19}\) )?
Explanation opens after your attempt
B. ( -15 )
Concept
Conjugate multiplication gives (22-\(\sqrt{19}\)2=4-19=-15). The middle terms cancel.
Why this answer is correct
The correct answer is B. ( -15 ). Conjugate multiplication gives (22-\(\sqrt{19}\)2=4-19=-15). The middle terms cancel.
Exam Tip
संयुग्मी गुणन से (22-\(\sqrt{19}\)2=4-19=-15) मिलता है। मध्य पद कट जाते हैं।
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