Step 1: Identify the matrix I. The matrix I is [[1, 0, 2], [0, 1, 3], [1, 0, 4]].
Step 2: Use the formula for the determinant of a 3x3 matrix: det(I) = a(ei - fh) - b(di - fg) + c(dh - eg), where the matrix is [[a, b, c], [d, e, f], [g, h, i]].
Step 3: Assign values from the matrix to the variables: a = 1, b = 0, c = 2, d = 0, e = 1, f = 3, g = 1, h = 0, i = 4.
Step 4: Calculate ei - fh: ei = 1*4 = 4 and fh = 3*0 = 0, so ei - fh = 4 - 0 = 4.
Step 5: Calculate di - fg: di = 0*4 = 0 and fg = 3*1 = 3, so di - fg = 0 - 3 = -3.
