feat: fix test cases

Author: sailok.chinta

src/test/java/com/thealgorithms/maths/QuadraticEquationSolverTest.java

@@ -40,9 +40,9 @@ public void testSolveEquation_imaginaryRoots() {
 
         ComplexNumber[] roots = quadraticEquationSolver.solveEquation(a, b, c);
         Assertions.assertEquals(roots.length, 2);
-        Assertions.assertEquals(roots[0].real, -0.8695652173913);
-        Assertions.assertEquals(roots[0].imaginary, 1.2956229935436);
-        Assertions.assertEquals(roots[1].real, -0.8695652173913);
-        Assertions.assertEquals(roots[1].imaginary, -1.2956229935436);
+        Assertions.assertEquals(roots[0].real, -0.8695652173913044);
+        Assertions.assertEquals(roots[0].imaginary, 0.27810465435684306);
+        Assertions.assertEquals(roots[1].real, -0.8695652173913044);
+        Assertions.assertEquals(roots[1].imaginary, -0.27810465435684306);
     }
 }