Update index.ipynb

index.ipynb

@@ -115,7 +115,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "$$ \\text{cost function ridge}= \\sum_{i=1}^n(y_i - \\hat{y})^2 = \\sum_{i=1}^n(y_i - \\sum_{j=1}^k(m_jx_{ij})-b)^2 + \\lambda \\sum_{j=1}^p m_j^2$$"
+    "$$ \\text{cost function ridge}= \\sum_{i=1}^n\Big(y_i - (m_1x_{1i} + m_2x_{2i}) - b\Big)^2  + \lambda m_1^2 + \lambda m_2^2$$"
    ]
   },
   {