Calculate the determinant of the matrix F = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]. (
Practice Questions
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Calculate the determinant of the matrix F = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]. (2022)
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Questions & Step-by-Step Solutions
Calculate the determinant of the matrix F = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]. (2022)
Step 1: Identify the matrix F, which is F = [[1, 2, 3], [4, 5, 6], [7, 8, 9]].
Step 2: Understand that the determinant is a special number that can be calculated from a square matrix.
Step 3: To calculate the determinant of a 3x3 matrix, use the formula: det(F) = a(ei - fh) - b(di - fg) + c(dh - eg), where the matrix is represented as: [[a, b, c], [d, e, f], [g, h, i]].
Step 4: For our matrix F, we have: a=1, b=2, c=3, d=4, e=5, f=6, g=7, h=8, i=9.
Step 5: Substitute the values into the determinant formula: det(F) = 1(5*9 - 6*8) - 2(4*9 - 6*7) + 3(4*8 - 5*7).
Step 7: Calculate the second part: 4*9 = 36, 6*7 = 42, so 4*9 - 6*7 = 36 - 42 = -6.
Step 8: Calculate the third part: 4*8 = 32, 5*7 = 35, so 4*8 - 5*7 = 32 - 35 = -3.
Step 9: Now substitute these results back into the determinant formula: det(F) = 1*(-3) - 2*(-6) + 3*(-3).
Step 10: Calculate: det(F) = -3 + 12 - 9 = 0.
Step 11: Conclude that the determinant of matrix F is 0.
Step 12: Note that a determinant of 0 indicates that the rows of the matrix are linearly dependent.
Determinant Calculation – The determinant of a matrix is a scalar value that can be computed from its elements and provides important properties about the matrix, such as whether it is invertible.
Linear Dependence – Rows or columns of a matrix are linearly dependent if at least one row or column can be expressed as a linear combination of others, which results in a determinant of zero.
