The line y=mx−2y=mx-2y=mx−2 is a tangent to the circle x2+6x+y2−8y+5=0x^2+6x+y^2-8y+5=0x2+6x+y2−8y+5=0.
Find the two possible values of mmm, giving your answers in exact form.
9 exam-style questions on Edexcel AS Level Maths 2.4 The Discriminant. Each one has a worked solution and a mark scheme showing where the marks go.