# Past Papers’ Solutions | Edexcel | AS & A level | Mathematics | Core Mathematics 1 (C1-6663/01) | Year 2007 | June | Q#7

Question The equation , where k is a constant, has different real roots. a.   Show that . b.   Find the set of possible values of k. Solution a.   We are given; We are given that given equation has different real roots. For a quadratic equation , the expression for solution is; Where  is called discriminant. […]