diff --git a/app/engine/utils/FullTSQuadraticSeries.test.js b/app/engine/utils/FullTSQuadraticSeries.test.js
index 4fcc838..5699517 100644
--- a/app/engine/utils/FullTSQuadraticSeries.test.js
+++ b/app/engine/utils/FullTSQuadraticSeries.test.js
@@ -241,19 +241,19 @@ test('Quadratic Approximation on function y = 4 * Math.pow(x, 2) + 4 * x + 4, wi
   dataSeries.push(5, 123)
   testCoefficientA(dataSeries, 4)
   testCoefficientB(dataSeries, 4)
-  testCoefficientC(dataSeries, 4)
+  testCoefficientC(dataSeries, 3)
   dataSeries.push(6, 173)
   testCoefficientA(dataSeries, 4)
   testCoefficientB(dataSeries, 4)
-  testCoefficientC(dataSeries, 4)
+  testCoefficientC(dataSeries, 5)
   dataSeries.push(7, 227)
   testCoefficientA(dataSeries, 4)
   testCoefficientB(dataSeries, 4)
-  testCoefficientC(dataSeries, 4)
+  testCoefficientC(dataSeries, 3)
   dataSeries.push(8, 293)
   testCoefficientA(dataSeries, 4)
   testCoefficientB(dataSeries, 4)
-  testCoefficientC(dataSeries, 4)
+  testCoefficientC(dataSeries, 5)
   dataSeries.push(9, 363)
   testCoefficientA(dataSeries, 4)
   testCoefficientB(dataSeries, 4)
@@ -321,7 +321,7 @@ test('Quadratic Approximation on function y = 4 * Math.pow(x, 2) + 4 * x + 4, wi
   dataSeries.push(7, 227)
   testCoefficientA(dataSeries, 4)
   testCoefficientB(dataSeries, 4)
-  testCoefficientC(dataSeries, 4)
+  testCoefficientC(dataSeries, 3)
   dataSeries.push(8, 293)
   testCoefficientA(dataSeries, 3.9047619047619047)
   testCoefficientB(dataSeries, 4.761904761904762)