यदि (-3) समीकरण \(x^2+ux-18=0\) का मूल है तो (u) का मान क्या है?

If (-3) is a root of \(x^2+ux-18=0\), what is the value of (u)?

Explanation opens after your attempt
Correct Answer

A. (-9)

Step 1

Concept

Putting (x=-3) gives (9-3u-18=0), so (u=-3), not (u=3).

Step 2

Why this answer is correct

The correct answer is A. (-9). Putting (x=-3) gives (9-3u-18=0), so (u=-3), not (u=3).

Step 3

Exam Tip

(x=-3) रखने पर (9-3u-18=0) इसलिए (u=-3) नहीं बल्कि (u=-3)?

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Mathematics Answer, Explanation and Revision Hints

यदि (-3) समीकरण \(x^2+ux-18=0\) का मूल है तो (u) का मान क्या है? / If (-3) is a root of \(x^2+ux-18=0\), what is the value of (u)?

Correct Answer: A. (-9). Explanation: (x=-3) रखने पर (9-3u-18=0) इसलिए (u=-3) नहीं बल्कि (u=-3)? / Putting (x=-3) gives (9-3u-18=0), so (u=-3), not (u=3).

Which concept should I revise for this Mathematics MCQ?

Putting (x=-3) gives (9-3u-18=0), so (u=-3), not (u=3).

What exam hint can help solve this Mathematics question?

(x=-3) रखने पर (9-3u-18=0) इसलिए (u=-3) नहीं बल्कि (u=-3)?