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))?

Author: Muft Shiksha Editorial Team Published:
Explanation opens after your attempt
Correct Answer

B. (-15)

Step 1

Concept

From (5r-9=21), we get (r=6). Therefore (p(-1)=6(-1)-9=-15).

Step 2

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).

Step 3

Exam Tip

(5r-9=21) से (r=6) मिलता है। इसलिए (p(-1)=6(-1)-9=-15) है।

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Mathematics Answer, Explanation and Revision Hints

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))?

Correct Answer: B. (-15). Explanation: (5r-9=21) से (r=6) मिलता है। इसलिए (p(-1)=6(-1)-9=-15) है। / From (5r-9=21), we get (r=6). Therefore (p(-1)=6(-1)-9=-15).

Which concept should I revise for this Mathematics MCQ?

From (5r-9=21), we get (r=6). Therefore (p(-1)=6(-1)-9=-15).

What exam hint can help solve this Mathematics question?

(5r-9=21) से (r=6) मिलता है। इसलिए (p(-1)=6(-1)-9=-15) है।