The equation kx2+(5k+2)x+4k=0kx^2 + (5k+2)x + 4k = 0kx2+(5k+2)x+4k=0, where k k\,k is a constant, has no real roots.
Find the set of possible values for kkk.
49 exam-style questions on Edexcel A Level Maths 2.4 The Discriminant. Each one has a worked solution and a mark scheme showing where the marks go.