The equation x2+kx+2=0x^2 + kx + 2 = 0x2+kx+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.