ExamBro
ExamBro
enEnglishhiहिन्दीguગુજરાતી
JEE Mains · Maths · STD 11 - 4.2 Quadratic equations and inequations

ધારો કે \(f: \mathbf{R}-\{0\} \rightarrow(-\infty, 1)\) એ 2 ઘાતવાળી બહુપદી છે, જે \(f(x) f\left(\frac{1}{x}\right)=f(x)+f\left(\frac{1}{x}\right)\) ને સંતોષે છે. જો \(f(K)=-2 K\) હોય, તો \(K\) ના તમામ શક્ય મૂલ્યોના વર્ગોનો સરવાળો છે :

  1. A \(7\)
  2. B \(6\)
  3. C \(1\)
  4. D \(9\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(6\)

Step-by-step Solution

Detailed explanation

as \(f(x)\) is a polynomial of degree two let it be \(f(x)=a x^2+b x+c \quad(a \neq 0)\) on satisfying given conditions we get \(C=1 \& a= \pm 1\) hence \(f(x)=1 \pm x^2\) also range \(\in(-\infty, 1]\) hence \(f(x)=1-x^2\) now \(f(k)=-2 k\)…
Same subject
Explore more questions on app
From JEE Mains
Explore more questions on app