NCERT Solutions for Class 12 Maths Chapter 4 Determinants Exercise 4.5

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Jasmine Grover

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NCERT Solutions for Class 12 Maths Chapter 4 Determinants Exercise 4.5 is provided in this article with step by step explanation. Chapter 4 Exercise 4.5 has questions covering concepts of determinants such as how to find the inverse of a matrix using adjoint. The questions make use of many theorems to deal with the adjoint and Inverse of a Matrix.

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CBSE CLASS XII Related Questions

  • 1.

    If \[ B(\operatorname{adj} B)= \begin{bmatrix} \frac{1}{3} & 0 & 0\\ 0 & \frac{1}{3} & 0\\ 0 & 0 & \frac{1}{3} \end{bmatrix}, \] then the value of \[ \det(B^{-1}) \] is: 

      • \(\frac{1}{3}\)
      • \(\frac{1}{9}\)
      • \(3\)
      • \(9\)

    • 2.
      For a square matrix \(A\), \[ (3A)^{-1}= \]

        • \( 3A^{-1} \)
        • \( 9A^{-1} \)
        • \( \frac{1}{3} A^{-1} \)
        • \( \frac{1}{9} A^{-1} \)

      • 3.
        A function \[ f:\mathbb{R}-\left\{\frac{3}{5}\right\} \to \mathbb{R}-\left\{\frac{3}{5}\right\} \] is defined as \[ f(x)=\frac{3x+2}{5x-3}. \] Show that \(f\) is one-one and onto.


          • 4.

            The domain of \[ f(x)=\cos^{-1}(2x-5) \] is: 

              • \([-1, 1]\)
              • \([4, 6]\)
              • \([-7, -3]\)
              • \([2, 3]\)

            • 5.

              Sports car racing is a form of motorsport which uses sports car prototypes.The competition is held on special tracks designed in various shapes. 

              The equation of a sports car racing track is given as: \[ f(x)= \begin{cases} x^4-4x^2+4, & 0\leq x<3,\\ x^2+40, & x\geq 3 \end{cases} \] Based on this information:


                • 6.
                  For \[ f(x)=x+\frac{1}{x}, \quad x\neq 0. \]

                    • local maximum value is 2
                    • local minimum value is \( -2 \)
                    • local maximum value is \( -2 \)
                    • local minimum value \( < \) local maximum value
                  CBSE CLASS XII Previous Year Papers

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