diff --git a/Polynomial Regression.ipynb b/Polynomial Regression.ipynb
index cb73bd2..36f9f60 100644
--- a/Polynomial Regression.ipynb	
+++ b/Polynomial Regression.ipynb	
@@ -532,35 +532,6 @@
     "plot_cost_function(logs_5)"
    ]
   },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "## 5. Reprezentacja graficzna funkcji kosztu"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "def plot_cost_function(logs):\n",
-    "    no_iter = no_iter = [x for x in range(1, len(logs) + 1)]\n",
-    "    all_cost = [row[0] for row in logs]\n",
-    "    plt.plot(no_iter, all_cost)"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "# MBGD\n",
-    "plot_cost_function(logs_2)"
-   ]
-  },
   {
    "cell_type": "markdown",
    "metadata": {},