diff --git a/source/calculus/source/03-AD/08.ptx b/source/calculus/source/03-AD/08.ptx
index 5ac6ffc61..f533b98bb 100644
--- a/source/calculus/source/03-AD/08.ptx
+++ b/source/calculus/source/03-AD/08.ptx
@@ -295,7 +295,7 @@
                 <m>V(x) = x^2 (8 - x)</m>
               </li>
               <li>
-                <m>V(x) = x^2 (8 - 2x)</m>
+                <m>V(x) = x (8 - 2x)^2</m>
               </li>
               <li>
                 <m>V(x) = x(8 - x)^2</m>
@@ -304,7 +304,7 @@
           </statement>
           <answer>
             <p>
-              C. <m>V(x) = x^2 (8 - 2x)</m>
+              C. <m>V(x) = x (8 - 2x)^2</m>
             </p>
           </answer>
         </task>
@@ -347,7 +347,7 @@
               <m>(8-2x)^2 - 2x = 0</m>
             </li>
             <li>
-              <m>(8-2x)^2 - 2x(8-2x) = 0</m>
+              <m>(8-2x)^2 + 2x(8-2x)(-2) = 0</m>
             </li>
           </ol>
          </statement>