Find the set of values of a a\,a for which the equation ax2+7x+4=0ax^2 + 7x + 4 = 0ax2+7x+4=0 has no real roots.
Practise Edexcel AS Level Maths Quadratics with exam-style questions for AS Level Maths. 25 questions 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, matched to the Edexcel AS Level Maths (8MA0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.