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JEE Mains · Maths · STD 12 - 3 and 4 . metrices and determinant

જો દરેક \(x \in \mathbb{R}\) માટે \(f(x)=\left|\begin{array}{ccc}x^3 & 2 x^2+1 & 1+3 x \\ 3 x^2+2 & 2 x & x^3+6 \\ x^3-x & 4 & x^2-2\end{array}\right|\) હોય તો \(2 f(0)+f^{\prime}(0)\) ની કિંમત મેળવો.

  1. A \(48\)
  2. B \(24\)
  3. C \(42\)
  4. D \(18\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(42\)

Step-by-step Solution

Detailed explanation

\(\mathrm{f}(0)=\left|\begin{array}{ccc}0 & 1 & 1 \\ 2 & 0 & 6 \\ 0 & 4 & -2\end{array}\right|=12\) \(f^{\prime}(x)=\left|\begin{array}{ccc}3 x^2 & 4 x & 3 \\ 3 x^2+2 & 2 x & x^3+6 \\ x^3-x & 4 & x^2-2\end{array}\right|+\)…
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