Find the determinant of the matrix \( \begin{pmatrix} 2 & 1 \\ 3 & 4 \en
Practice Questions
Q1
Find the determinant of the matrix \( \begin{pmatrix} 2 & 1 \\ 3 & 4 \end{pmatrix} \).
5
10
7
6
Questions & Step-by-Step Solutions
Find the determinant of the matrix \( \begin{pmatrix} 2 & 1 \\ 3 & 4 \end{pmatrix} \).
Correct Answer: 5
Step 1: Identify the elements of the matrix. The matrix is \( \begin{pmatrix} 2 & 1 \\ 3 & 4 \end{pmatrix} \). The elements are: a = 2, b = 1, c = 3, d = 4.
Step 2: Use the formula for the determinant of a 2x2 matrix, which is given by \( ad - bc \).
Step 3: Substitute the values into the formula. Here, a = 2, b = 1, c = 3, d = 4. So, we calculate: \( 2*4 - 1*3 \).
Step 4: Perform the multiplication: \( 2*4 = 8 \) and \( 1*3 = 3 \).
Step 5: Subtract the second result from the first: \( 8 - 3 = 5 \).
