यदि (p(x)=x-2-2kx+20) के शून्यक \(k+\sqrt{5}\) और \(k-\sqrt{5}\) हैं, तो (k) का धनात्मक मान क्या है?
If the zeroes of (p(x)=x-2-2kx+20) are \(k+\sqrt{5}\) and \(k-\sqrt{5}\), what is the positive value of (k)?
Explanation opens after your attempt
Correct Answer
A. (5)
Concept
From the product \(k^2-5=20\) we get \(k^2=25\) and positive (k=5). In exams find the unknown from the product.
Why this answer is correct
The correct answer is A. (5). From the product \(k^2-5=20\) we get \(k^2=25\) and positive (k=5). In exams find the unknown from the product.
Exam Tip
गुणनफल \(k^2-5=20\) से \(k^2=25\) और धनात्मक (k=5) है। परीक्षा में गुणनफल से अज्ञात निकालें।
Login to save your score, XP, coins and progress.