यदि (r=-3), तो \(2r^3+5r^2-4r\) का मान क्या होगा?
If (r=-3), what is the value of \(2r^3+5r^2-4r\)?
Explanation opens after your attempt
A. (3)
Concept
Substitution gives (2(-27)+5(9)+12=3). In an odd power, the negative sign remains.
Why this answer is correct
The correct answer is A. (3). Substitution gives (2(-27)+5(9)+12=3). In an odd power, the negative sign remains.
Exam Tip
मान रखने पर (2(-27)+5(9)+12=3) मिलता है। विषम घात में ऋणात्मक चिह्न बना रहता है।
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