यदि (-2) समीकरण \(x^2+kx+4=0\) का मूल है तो (k) का मान क्या है?
If (-2) is a root of \(x^2+kx+4=0\) then what is the value of (k)?
Explanation opens after your attempt
B. (4)
Concept
Putting (x=-2) gives (4-2k+4=0) so (k=4). Be careful with signs while substituting a negative root.
Why this answer is correct
The correct answer is B. (4). Putting (x=-2) gives (4-2k+4=0) so (k=4). Be careful with signs while substituting a negative root.
Exam Tip
(x=-2) रखने पर (4-2k+4=0) इसलिए (k=4)। ऋणात्मक मूल रखते समय चिन्ह सावधानी से लगाएं।
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