The equation kx2+5x+k=0kx^2 + 5x + k = 0kx2+5x+k=0, where k k\,k is a positive constant, has equal roots.
Find the value of kkk.
63 exam-style questions on AQA A Level Maths 1.5.3 Quadratic functions. Each one has a worked solution and a mark scheme showing where the marks go.