The line y=2x+1y=2x+1y=2x+1 is tangent to the curve y=x2+ky=x^2+ky=x2+k, where k k\,k is a constant.
Find the value of 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.