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  • Need RD Sharma solution for Maths Class 12 Chapter 5 Determinants Exercise Very short question Question 10 for maths textbook solution.

Need RD Sharma solution for Maths Class 12 Chapter 5 Determinants Exercise Very short question Question 10 for maths textbook solution.

Answers (1)

Answer: -8

Hint: Here we use basic concept of determinant of matrix

Given: \left|\begin{array}{ll} 4785 & 4787 \\ 4789 & 4791 \end{array}\right|

Solution:

\rightarrow let's perform some column operations

\begin{aligned} &C_{1} \rightarrow C_{1}-C_{2} \\ &\left|\begin{array}{cc} -2 & 4787 \\ -2 & 4791 \end{array}\right| \end{aligned}

\rightarrow let's take (-2) common from column (1)

\begin{aligned} &(-2)\left|\begin{array}{ll} 1 & 4787 \\ 1 & 4791 \end{array}\right| \\ &=-2[1 \times 4791-4787] \\ &=-2[4] \\ &=-8 \end{aligned}

 

 

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