diff --git a/OpenProblemLibrary/272/setStewart14_1/problem_4.pg b/OpenProblemLibrary/272/setStewart14_1/problem_4.pg
index b40b6b84f7..ce29a0ae40 100644
--- a/OpenProblemLibrary/272/setStewart14_1/problem_4.pg
+++ b/OpenProblemLibrary/272/setStewart14_1/problem_4.pg
@@ -37,7 +37,7 @@ $showPartialCorrectAnswers = 0;
 @questions = (
               "\(f(x,y) = 1/(1 + x^2 + y^2)\)",
               "\(f(x,y) = (x^2 - y^2)^2\)",
-              "\(f(x,y) = (x - y)^2\)",
+              "\(f(x,y) = (x + y)^2\)",
               "\(f(x,y) = \cos(x^2 + y^2)/(1 + x^2 + y^2)\)",
               "\(f(x,y) = \sin(x)\)",
               "\(f(x,y) = 3 - x^2 - y^2\)",