यदि (x=2) समीकरण \(x^2+kx+2=0\) का मूल है तो (k) का मान क्या होगा?

If (x=2) is a root of \(x^2+kx+2=0\), what is the value of (k)?

Explanation opens after your attempt
Correct Answer

B. (-3)

Step 1

Concept

Putting (x=2) gives (4+2k+2=0), so (k=-3). If a root is given, substitute it in the equation.

Step 2

Why this answer is correct

The correct answer is B. (-3). Putting (x=2) gives (4+2k+2=0), so (k=-3). If a root is given, substitute it in the equation.

Step 3

Exam Tip

(x=2) रखने पर (4+2k+2=0) इसलिए (k=-3) मिलता है। मूल दिया हो तो उसे समीकरण में रखें।

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Mathematics Answer, Explanation and Revision Hints

यदि (x=2) समीकरण \(x^2+kx+2=0\) का मूल है तो (k) का मान क्या होगा? / If (x=2) is a root of \(x^2+kx+2=0\), what is the value of (k)?

Correct Answer: B. (-3). Explanation: (x=2) रखने पर (4+2k+2=0) इसलिए (k=-3) मिलता है। मूल दिया हो तो उसे समीकरण में रखें। / Putting (x=2) gives (4+2k+2=0), so (k=-3). If a root is given, substitute it in the equation.

Which concept should I revise for this Mathematics MCQ?

Putting (x=2) gives (4+2k+2=0), so (k=-3). If a root is given, substitute it in the equation.

What exam hint can help solve this Mathematics question?

(x=2) रखने पर (4+2k+2=0) इसलिए (k=-3) मिलता है। मूल दिया हो तो उसे समीकरण में रखें।