यदि (p(x)=rx-9) और (p(5)=21), तो (p(-1)) का मान क्या है?
If (p(x)=rx-9) and (p(5)=21), what is the value of (p(-1))?
Explanation opens after your attempt
B. (-15)
Concept
From (5r-9=21), we get (r=6). Therefore (p(-1)=6(-1)-9=-15).
Why this answer is correct
The correct answer is B. (-15). From (5r-9=21), we get (r=6). Therefore (p(-1)=6(-1)-9=-15).
Exam Tip
(5r-9=21) से (r=6) मिलता है। इसलिए (p(-1)=6(-1)-9=-15) है।
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