Easy Mathematics Quadratic Equations Class 10 Level 31

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
Correct Answer

B. (4)

Step 1

Concept

Putting (x=-2) gives (4-2k+4=0) so (k=4). Be careful with signs while substituting a negative root.

Step 2

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.

Step 3

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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FAQs

Mathematics Answer, Explanation and Revision Hints

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)?

Correct Answer: B. (4). Explanation: (x=-2) रखने पर (4-2k+4=0) इसलिए (k=4)। ऋणात्मक मूल रखते समय चिन्ह सावधानी से लगाएं। / Putting (x=-2) gives (4-2k+4=0) so (k=4). Be careful with signs while substituting a negative root.

Which concept should I revise for this Mathematics MCQ?

Putting (x=-2) gives (4-2k+4=0) so (k=4). Be careful with signs while substituting a negative root.

What exam hint can help solve this Mathematics question?

(x=-2) रखने पर (4-2k+4=0) इसलिए (k=4)। ऋणात्मक मूल रखते समय चिन्ह सावधानी से लगाएं।

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