The equation kx2+6kx+2=0kx^2 + 6kx + 2 = 0kx2+6kx+2=0, where k k\,k is a constant, has no real roots.
Find the set of possible values for kkk.
211 exam-style questions on Edexcel A Level Maths Quadratics, covering 2.1 Solving Quadratics, 2.2 Completing the Square, 2.3 Sketching Quadratic Graphs, 2.4 The Discriminant, and 2.5 Modelling with Quadratics. Each one has a worked solution and a mark scheme showing where the marks go.