यदि \(4x^2+kx+28=0\) में मूलों का गुणनफल मूलों के योग का (-2) गुना है, तो (k) क्या होगा?
If in \(4x^2+kx+28=0\), the product of roots is (-2) times the sum of roots, what is (k)?
Explanation opens after your attempt
Correct Answer
A. (14)
Concept
The product is (7) and the sum is \(-\frac{k}{4}\). From (7=-2\left\(-\frac{k}{4}\right\)), we get (k=14).
Why this answer is correct
The correct answer is A. (14). The product is (7) and the sum is \(-\frac{k}{4}\). From (7=-2\left\(-\frac{k}{4}\right\)), we get (k=14).
Exam Tip
गुणनफल (7) और योग \(-\frac{k}{4}\) है। (7=-2\left\(-\frac{k}{4}\right\)) से (k=14) मिलता है।
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