Work out (2)2−4(1)(−2)(2)^2 - 4(1)(-2)(2)2−4(1)(−2).
Hence, solve x2+2x−2=0x^2 + 2x - 2 = 0x2+2x−2=0
Give your answers in the form a±bca \pm b\sqrt{c}a±bc.
156 exam-style questions on OCR GCSE Maths Quadratic Formula. Each one has a worked solution and a mark scheme showing where the marks go.