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

જો \(g(x)=3 x^2+2 x-3, f(0)=-3\) અને \(4 g(f(x))=3 x^2-32 x+72\) હોય, તો \(f(g(2))=\) ___ .

  1. A \(\frac{25}{6}\)
  2. B \(-\frac{25}{6}\)
  3. C \(\frac{7}{2}\)
  4. D \(-\frac{7}{2}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\frac{7}{2}\)

Step-by-step Solution

Detailed explanation

\(g(2)=13\) \(f(g(2))=f(13)\) Now \(4g(f(x))=3x^{2}-32x+72\) \(4[3f^{2}(x)+2f(x)-3]=3x^{2}-32x+72\) Let \(f(x)=t\) \(12t^{2}+8t-(3x^{2}-32x+84)=0\) \(f(x)=\frac{-8\pm\sqrt{64+48(3x^{2}-32x+84)}}{24}\) \(f(x)=\frac{-8\pm4(3x-16)}{24}\) \(\because f(0)=-3 \quad \therefore\) we…
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