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JEE Mains · Maths · STD 12 - 1. relation and function

\(x \in \mathbb{R}\) के लिए दो वास्तविक फलन \(f(x)\) तथा \(g(x)\) इस प्रकार है कि \(\mathrm{g}(\mathrm{x})=\sqrt{\mathrm{x}}+1\) तथा \(f \circ g(x)=x+3-\sqrt{x}\) हैं। तो \(f(0)\) बराबर है

  1. A \(1\)
  2. B \(-3\)
  3. C \(5\)
  4. D \(0\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(5\)

Step-by-step Solution

Detailed explanation

\(g(x)=\sqrt{x}+1\) \(f \circ g(x)=x+3-\sqrt{x}\) \(=(\sqrt{x}+1)^2-3(\sqrt{x}+1)+5\) \(=g^2(x)-3 g(x)+5\) \(\Rightarrow f(x)=x^2-3 x+5\) \(\therefore f(0)=5\)
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