diff --git a/app/engine/utils/FullTSQuadraticSeries.test.js b/app/engine/utils/FullTSQuadraticSeries.test.js
index 6c9a054..e19bfb6 100644
--- a/app/engine/utils/FullTSQuadraticSeries.test.js
+++ b/app/engine/utils/FullTSQuadraticSeries.test.js
@@ -217,7 +217,7 @@ test('Quadratic Approximation on function y = 4 * Math.pow(x, 2) + 4 * x + 4, wi
   dataSeries.push(-1, 3)
   testCoefficientA(dataSeries, 4)
   testCoefficientB(dataSeries, 4)
-  testCoefficientC(dataSeries, 4)
+  testCoefficientC(dataSeries, 3)
   dataSeries.push(0, 5)
   testCoefficientA(dataSeries, 4)
   testCoefficientB(dataSeries, 4)
@@ -305,7 +305,7 @@ test('Quadratic Approximation on function y = 4 * Math.pow(x, 2) + 4 * x + 4, wi
   dataSeries.push(3, 51)
   testCoefficientA(dataSeries, 4)
   testCoefficientB(dataSeries, 4)
-  testCoefficientC(dataSeries, 4)
+  testCoefficientC(dataSeries, 3)
   dataSeries.push(4, 85)
   testCoefficientA(dataSeries, 4)
   testCoefficientB(dataSeries, 4)