The diagram shows a right angled triangle. All measurements are given in centimetres.
Show that x2−4x−20=0x^2 - 4x - 20 = 0x2−4x−20=0
Find the value of xxx. Give your answer in the form a±bca \pm b\sqrt{c}a±bc.
49 exam-style questions on AQA GCSE Maths Quadratic Formula. Each one has a worked solution and a mark scheme showing where the marks go.