Verify that the solutions to 5x2−80=05x^2 - 80 = 05x2−80=0 are x=−4x = -4x=−4 and x=4x = 4x=4.
223 exam-style questions on OCR GCSE Maths Factorising Harder Quadratics. Each one has a worked solution and a mark scheme showing where the marks go.