diff --git a/Questions.txt b/Questions.txt
index 7b0de16..72c4ed4 100644
--- a/Questions.txt
+++ b/Questions.txt
@@ -38,6 +38,11 @@ contrib_one = True
 
 + Solve equation \frac{d^2 u}{dx^2}-x\frac{du}{dx}+u=0
 
+	 d^(2) * u			d * u
+F: ------------- -x * ---------- + u = 0
+	   dx^2				d * x
+          
+
 -------------------------------------------------------
 #08
 Perfect.