By completing the square, find, in terms of the constant ppp, the roots of the equation x2+px+4=0x^2 + px + 4 = 0x2+px+4=0
Hence 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.