Verify that x=3x=3x=3 and x=−14x=-14x=−14 are solutions of x2+11x−42=0x^2 + 11x - 42 = 0x2+11x−42=0
203 exam-style questions on OCR GCSE Maths Solving Quadratics. Each one has a worked solution and a mark scheme showing where the marks go.