diff --git a/part-03-multivariable-functions/03-optimization-in-multiple-variables.ipynb b/part-03-multivariable-functions/03-optimization-in-multiple-variables.ipynb
index 4a9496e..b9efb68 100644
--- a/part-03-multivariable-functions/03-optimization-in-multiple-variables.ipynb
+++ b/part-03-multivariable-functions/03-optimization-in-multiple-variables.ipynb
@@ -53,7 +53,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -66,7 +66,6 @@
     "        \"\"\"\n",
     "        x: np.array of shape (2, )\n",
     "        \"\"\"\n",
-    "        x = x.reshape(2)\n",
     "        return self.a*x[0] + self.b*x[1]\n",
     "    \n",
     "    def grad(self, x: np.array):\n",