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Fed [463]
3 years ago
6

Suppose C is a 3 x 3 matrix such that det (C) = 4. Show that det (C+C) is equal to 32

Mathematics
1 answer:
Ber [7]3 years ago
7 0

Step-by-step explanation:

Let's consider C is a matrix given by

\left[\begin{array}{ccc}a&b&c\\d&e&f\\g&h&i\end{array}\right]

them determinant of matrix C can be written as

\begin{vmatrix}a & b & c\\ d & e & f\\  g & h & i \end{vmatrix}\ =\ 4.....(1)

Now,

det (C+C)\ =\ \begin{vmatrix}a & b & c\\ d & e & f\\  g & h & i \end{vmatrix}\ +\ \begin{vmatrix}a & b & c\\ d & e & f\\  g & h & i \end{vmatrix}

                  =\ \begin{vmatrix}2a & 2b & 2c\\ 2d & 2e & 2f\\  2g & 2h & 2i \end{vmatrix}

                   =\ 2\times 2\times 2\times \begin{vmatrix}a & b & c\\ d & e & f\\  g & h & i \end{vmatrix}

                   =\ 8\times 4\ \ \ \ \ \ \ \         from\ eq.(1)

                    = 32      

Hence, det (C+C) = 32

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Answer:

It's the third option: (x^2 - 5)(x - 7).

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