diff --git a/app/engine/utils/FullTSQuadraticSeries.test.js b/app/engine/utils/FullTSQuadraticSeries.test.js
index c7a8464185..3d3542bb29 100644
--- a/app/engine/utils/FullTSQuadraticSeries.test.js
+++ b/app/engine/utils/FullTSQuadraticSeries.test.js
@@ -201,7 +201,7 @@ test('Quadratic Approximation on function y = 4 * Math.pow(x, 2) + 4 * x + 4, wi
   dataSeries.push(-5, 83)
   testCoefficientA(dataSeries, 3.8666666666666667)
   testCoefficientB(dataSeries, 1.8666666666666742)
-  testCoefficientC(dataSeries, -4.111111111111047)
+  testCoefficientC(dataSeries, -4.3333333333332575)
   dataSeries.push(-4, 53)
   testCoefficientA(dataSeries, 4)
   testCoefficientB(dataSeries, 4)
@@ -289,7 +289,7 @@ test('Quadratic Approximation on function y = 4 * Math.pow(x, 2) + 4 * x + 4, wi
   dataSeries.push(-1, 3)
   testCoefficientA(dataSeries, 3.9555555555555557)
   testCoefficientB(dataSeries, 3.37777777777778)
-  testCoefficientC(dataSeries, 2.2000000000000064)
+  testCoefficientC(dataSeries, 2.8666666666666742)
   dataSeries.push(0, 5)
   testCoefficientA(dataSeries, 4)
   testCoefficientB(dataSeries, 4)