The curve C C\,C has equation y=x2−4x+9y = x^2 - 4x + 9y=x2−4x+9.
The line l l\,l has equation y=3x+cy = 3x + cy=3x+c, where c c\,c is a constant.
Given that l l\,l is a tangent to CCC, find the value of ccc.
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.