Add feedback that det of ident matrix is always 1

Author: jmshea

03-matrices/questions/5-4-det-ident.json

@@ -4,8 +4,9 @@
     "question": "Find the determinant of the following 4x4 identity matrix by hand (do <b>not</b> use NumPy or a calculator):\n\\begin{equation}\n\\mathbf{I} = \\begin{bmatrix} 1 & 0 & 0 & 0 \\\\ 0 & 1 & 0 & 0 \\\\ 0 & 0 & 1 & 0 \\\\ 0 & 0 & 0 & 1 \\end{bmatrix}\n\\end{equation}",
     "answers": [
       {
-        "value": 1,
-        "correct": true
+          "value": 1,
+          "correct": true,
+          "feedback": "Correct! The determinant of any identity matrix is always 1."
       }
     ]
   },
@@ -14,8 +15,10 @@
     "question": "Find the determinant of the following 3x3 identity matrix by hand (do <b>not</b> use NumPy or a calculator):\n\\begin{equation}\n\\mathbf{I} = \\begin{bmatrix} 1 & 0 & 0 \\\\ 0 & 1 & 0 \\\\ 0 & 0 & 1 \\end{bmatrix}\n\\end{equation}",
     "answers": [
       {
-        "value": 1,
-        "correct": true
+          "value": 1,
+          "correct": true,
+          "feedback": "Correct! The determinant of any identity matrix is always 1."
+
       }
     ]
   }