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

किसी \(a, b, c \in \mathbb{N}\) के लिए, माना \(f(x)=a x-3\) तथा \(\mathrm{g}(\mathrm{x})=\mathrm{x}^{\mathrm{b}}+\mathrm{c}, \mathrm{x} \in \mathbb{R}\) है। यदि \((\operatorname{fog})^{-1}(\mathrm{x})=\left(\frac{\mathrm{x}-7}{2}\right)^{1 / 3}\) है, तो \((\mathrm{fog})(\mathrm{ac})+(\mathrm{g} \circ f)(\mathrm{b})\) बराबर ___________ है।

  1. A \(2038\)
  2. B \(2039\)
  3. C \(2040\)
  4. D \(2058\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(2039\)

Step-by-step Solution

Detailed explanation

Let \(f o g(x)=h(x)\) \(\Rightarrow h ^{-1}( x )=\left(\frac{ x -7}{2}\right)^{\frac{1}{3}}\) \(\Rightarrow h ( x )= fog ( x )=2 x ^3+7\) \(\text { fog }(x)=a\left(x^b+c\right)-3\) \(\Rightarrow a =2, b =3, c =5\) \(\Rightarrow \operatorname{fog}( ac )= fog (10)=2007\)…
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