The equation kx2+6kx+2=0kx^2 + 6kx + 2 = 0kx2+6kx+2=0 where k k\,k is a non-zero constant, has no real roots.
Find the set of possible values for kkk.
8 exam-style questions on OCR A Level Maths 1.2.4 Quadratic functions. Each one has a worked solution and a mark scheme showing where the marks go.