By completing the square, find in terms of the constant p p\,p the roots of the equation
x2+px+4=0 x^2 + px + 4 = 0 x2+px+4=0Hence find the set of values of p p\,p for which the equation has no real roots.
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.