यदि (x=-3) समीकरण \(2x^2+rx-9=0\) का मूल है, तो (r) का मान क्या होगा?
If (x=-3) is a root of \(2x^2+rx-9=0\), what is the value of (r)?
Explanation opens after your attempt
A. (3)
Concept
Putting (x=-3) gives (18-3r-9=0), so (r=3). If a root is given, substitute it into the equation.
Why this answer is correct
The correct answer is A. (3). Putting (x=-3) gives (18-3r-9=0), so (r=3). If a root is given, substitute it into the equation.
Exam Tip
(x=-3) रखने पर (18-3r-9=0) मिलता है, इसलिए (r=3) है। मूल दिया हो तो उसे समीकरण में रखें।
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