यदि \(f ( x )\), घात चार का एक शून्येत्तर बहुपद है, जिसके स्थानीय चरम बिंदु \(x =-1,0,1\) पर हैं, तो समुच्चय \(S =\{ x \in R : f ( x )= f (0)\}\) में मात्र:

A चार अपरिमेय संख्याएँ हैं।
B चार परिमेय संख्याएँ हैं।
C दो अपरिमेय तथा एक परिमेय संख्याएँ हैं।
D दो अपरिमेय तथा दो परिमेय संख्याएँ हैं।

Verified Solution

Answer & Solution

Correct Answer

(C) दो अपरिमेय तथा एक परिमेय संख्याएँ हैं।

Step-by-step Solution

Detailed explanation

\({f^\prime }(x) = \lambda (x + 1)(x - 0)(x - 1)\) \( = \lambda \left( {{x^3} - x} \right)\) \(\Rightarrow f(x)=\lambda\left(\frac{x^{4}}{4}-\frac{x^{2}}{2}\right)+\mu\) Now \(f(x)=f(0)\) \(\Rightarrow \lambda\left(\frac{x^{4}}{4}-\frac{x^{2}}{2}\right)+\mu=\mu\)…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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