public void GetValueTest()
        {
            double param = 4;
            var pol = new Polynomial(1, 2, -3);

            double result = pol.GetValue(param);

            Assert.AreEqual(result, -39);
        }
        public double GetValueTest(double[] coefs, double value)
        {
            Polynomial p = new Polynomial(coefs);

            return p.GetValue(value);
        }