diff --git a/src/de/dhbwka/java/exercise/control_structures/Quadratics.java b/src/de/dhbwka/java/exercise/control_structures/Quadratics.java
index f4f2d24..a2a26b6 100644
--- a/src/de/dhbwka/java/exercise/control_structures/Quadratics.java
+++ b/src/de/dhbwka/java/exercise/control_structures/Quadratics.java
@@ -23,8 +23,9 @@ public class Quadratics {
     } else {
       double d = b * b - 4 * a * c;
       if (d >= 0) {
-        double x1 = (-b + Math.sqrt(d)) / (2 * a);
-        double x2 = (-b - Math.sqrt(d)) / (2 * a);
+        double sqrtD = Math.sqrt(d);
+        double x1 = (-b + sqrtD) / (2 * a);
+        double x2 = (-b - sqrtD) / (2 * a);
         System.out.println("x1 = " + x1 + ", x2 = " + x2);
       } else {
         double real = -b / (2 * a);